2.1 Constructions and morphosyntax

As in other constructional theories (e.g. Goldberg Reference Goldberg1995; Bybee Reference Bybee2010; Traugott & Trousdale Reference Traugott and Trousdale2013; Diessel Reference Diessel2019), constructions in Radical Construction Grammar are learned and conventionalized form-meaning pairings. They consist of syntax, morphology, and phonology on the formal side and semantics, pragmatics, and discourse functions on the meaning side. Non-predictability is frequently used to define constructions: something is a construction iff some aspect of its form or meaning ‘is not strictly predictable from [a construction]’s component parts or from other previously established constructions’ (Goldberg Reference Goldberg1995: 4). Distributional preferences of the components of a construction, an aspect of non-predictability, can also be a criterion (Hilpert Reference Hilpert2014). The reasoning is that if something is non-predictable, users must learn and store its form and meaning. Sufficient frequency can lead to storage and hence constructions, too, but proposing a frequency threshold for constructions is problematic (Goldberg Reference Goldberg2019: 54).

A construction may be specific or schematic. A word like cake is a specific construction because its form is fully specified and arbitrarily (i.e. non-predictably) associated with its meaning. A bound morpheme, e.g. plural -s, is part of a schematic construction, as it abstracts over more specific constructions, e.g. cats, cakes, etc. The plural -s construction can be represented as [count_noun-s]. Brackets indicate that it is a construction, while small caps indicate a ‘slot’, or a position within a construction, which represents an abstraction over expressions that may occur there. For example, cat and cake may fill in the count_noun slot in the plural -s construction. A construction may be more complex than a word. The ditransitive construction has the form [subject verb object ₁ object ₂] with the meaning ‘X causes Y to receive Z’ (Goldberg Reference Goldberg1995). See Zhan & Traugott (Reference Zhan and Traugott2015), Zhan (Reference Zhan2017), Peng (Reference Peng2017), and Kuo (Reference Kuo2020, 2021, 2022a) for complex constructions in Chinese.

In Radical Construction Grammar, morphosyntactic categories are generalizations over items in particular slots and result from cross-constructional associations. An item is an adjective in the unfilled slots of the comparative construction ([adjective-er]) and the superlative one ([adjective-est]), because both slots are associated with the prototypical adjectival property of gradability and similar items may occur in both. For example, red is as an adjective in redder and reddest. However, this does not mean that red may not be something else. It is a noun in red is my favorite because it is in the subject position, a nominal slot. In other words, constructions are used as categorization tools for morphosyntax. The traditional category of an expression may be reconceptualized as derived from the most typical kind of slot that it occurs in.

2.2 Morphosyntactic vagueness in Radical Construction Grammar

Vagueness is a well-known concept in lexical semantics (e.g. Tuggy Reference Tuggy1993). For example, cousin is vague with respect to gender. Typically, this kind of underspecification does not hamper communication (unless specification is required contextually). This contrasts with ambiguity, where deciding on precisely which one of the possible meanings is intended by a speaker is typically at stake (e.g. bank ‘financial institution; river edge’). Recently, Denison (Reference Denison, Hundt and Pfenninger2017, Reference Denison, Van Goethem, Norde, Coussé and Vanderbauwhede2018) has extended vagueness to morphosyntax: the category status of an expression may be underdetermined.

Whereas Denison does not distinguish between types of morphosyntactic vagueness, two are proposed here: item-level and slot-level. An item is vague if it has multiple compatible analyses. A slot is vague if it generalizes over multiple compatible analyses of items in it. Slot-level vagueness is by definition schematic, as it generalizes over various similar instances, whereas item-level vagueness is lexically specific in the sense that it is associated with particular items. Distributional and functional similarities characterize both types.Footnote ³

Some English words display item-level vagueness between Noun and Adjective in some contexts. For example, most nouns and adjectives may occur in a pair of constructions with similar slots: the compounding construction [ noun noun] and the attributive adjective construction [ adjective noun], where the slots in bold are prenominal modifier slots. The category of a word in a prenominal modifier slot is vague between Noun and Adjective if the word may be attributed to [noun noun] and [adjective noun]. Such attribution is possible if there is no distributional pattern specific to Noun or Adjective (e.g. very preceding the slot renders it adjectival) and the word is functionally similar to Noun, in being referential, and Adjective, in being gradable. See Croft (Reference Croft2001: Ch. 2) for Noun, Verb, and Adjective in Radical Construction Grammar.

For example, Denison (Reference Denison, Hundt and Pfenninger2017: 304) observes that expert is an adjective in (4a) and a noun in (4b), but in (4c), where expert is a prenominal modifier, ‘AD/R [addressee/reader] cannot know whether expert is noun or adjective here… the choice makes no difference to interpretation and no difference to constituent structure.’

That is, expert help may be interpreted as noun noun or adjective noun. Yet it is not at issue which one it is because expert is similar to Noun and Adjective functionally (in being potentially referential and gradable) and distributionally (in occurring without category-specific morphosyntax, e.g. Noun-specific possessive ’s and Adjective-specific very). This type of vagueness that Denison discusses is more likely item-level than slot-level. For example, the prenominal items in expert advice, killer punches, and powerhouse songs are identified as vague by Denison, and such vagueness is more likely associated with the items and the phrases that they occur in, rather than with one schematic slot. In fact, most prenominal items are consistently nominal or adjectival. For example, bread in bread rolls is not vague, as it is not construed as gradable (cf. bready).

Lexically specific contexts where item-level vagueness is observed may be contexts of change. For example, Denison (Reference Denison, Hundt and Pfenninger2017: 305) suggests that, after occurring frequently before nouns, such as punch, killer may become vague and then adjectival (by acquiring gradable semantics). He thus likens lexically specific contexts of morphosyntactic vagueness to Heine’s (Reference Heine, Wischer and Diewald2002) bridging contexts, where original and innovative analyses overlap and enable morphosyntactic change. By the same token, as a vague slot generalizes over multiple vague items, it may also be a bridging context. The multiple analyses available in a vague context by definition have low saliency, a general enabler of change (De Smet Reference De Smet2012); this is because in such a context ‘the matter of which exact interpretation one selects is of little or no consequence’ (Traugott Reference Traugott, Hundt and Pfenninger2017: 100).Footnote ⁴

In sum, morphosyntactic vagueness is observed in contexts where distributional and functional similarities between multiple categories neutralize any possible distinction between such categories. Without distributional similarity, there will be category-specific cues (e.g. very cues Adjective). Without functional similarity, even given distributional similarity, morphosyntactic categories by hypothesis will serve distinct functional purposes that keep them conceptually apart, assuming a conceptual view on morphosyntax (e.g. Croft Reference Croft2001; Diessel Reference Diessel2019).

2.3 Morphosyntactic vagueness between Chinese Modal and Conditional

Sections 2.3.1–2.3.2 discuss distributional and functional similarities that characterize vagueness between Chinese Modal and Conditional, in order to show that a slot may be vague between Modal and Conditional.

2.3.1 Distributional similarities between Modal and Conditional

Modal in Chinese may be pre- or post-verbal. The post-verbal subtypes (Li & Thompson Reference Li and Thompson1981: Chs.7 & 22) will not be discussed, as their distributions are clearly distinct from Conditional, which is pre-verbal. The pre-verbal subtypes are Auxiliary and Adverb. Being distributionally more specialized than Adverb (Li & Thompson Reference Li and Thompson1981: Ch. 5), Auxiliary is more sharply distinguished from Conditional. Auxiliary and its distributional properties proposed by Li & Thompson (Reference Li and Thompson1981) will be examined vis-à-vis Conditional, to show that even assuming many and even stringent distributional criteria cannot reliably distinguish Auxiliary from Conditional. Henceforth, Modal exclusively refers to Auxiliary. This subsection is based on Kuo (Reference Kuo2022a, Reference Kuo2022b).

Li & Thompson (Reference Li and Thompson1981: Ch. 5) propose eight distributional criteria for Modal, summarized and renumbered in (5).Footnote ⁵

Criteria (5a, b) distinguish Modal from Conditional, but many verbs also occur in those constructions (Li & Thompson Reference Li and Thompson1981: 173). As no modal appears exclusively in these constructions, (5a, b) alone cannot reliably differentiate between Modal and Conditional. Like Modal, Conditional also does not occur in the constructions described in (5c–f).

Criteria (5g–h) deserve more discussion. A conditional takes a clausal complement and can be pre-subject or post-subject (Li & Thompson Reference Li and Thompson1981; Eifring Reference Eifring1995). Therefore, (5g) may distinguish Modal from Conditional. However, in null-subject contexts or when it is post-subject, a conditional immediately precedes the predicate, which would appear as if it took a verbal complement. Similarly, (5h) may distinguish between Modal and Conditional, but the latter is not consistently pre-subject and in null-subject contexts this criterion is ineffective. To provide evidence for the distribution of Conditional and its subject, 5,000 instances of ruò ‘if’, the most frequent Early Mandarin conditional, were sampled from the corpus. Assuming that a proper name, a common noun, or a pronoun immediately before or after ruò is the subject of the ruò-marked protasis, most instances of such protases are modal-like in being null-subject (4,244 instances) or post-subject (349). This means that in null-subject contexts, a modal may resemble a pre-subject or post-subject conditional, and a conditional a modal; (6) illustrates this possibility by describing Modal and Conditional (represented by if) word orders.

Some have argued that the criteria in (5) are too stringent (Tang Reference Tang1988: 228–235; Li Reference Li2004: Ch. 4; Peng Reference Peng2007: Ch. 2). Others have relaxed (5h) by defining Modal as possibly pre-subject (Tsao Reference Tsao1996), which blurs the distinction between Modal and Conditional even further. Nevertheless, the criteria in (5) are assumed here to show that even stringent criteria cannot reliably distinguish between Modal and Conditional.

Eifring (Reference Eifring1995: 54–55) proposes three distributional properties for Conditional and some (non-modal) adverbs, but they are not effective at distinguishing between Modal and Conditional. According to him, a conditional may immediately precede ne (a pause-marking particle similar to um), shuō ‘say’, and shì ‘be’. Shì may even be a bound component of a conditional (Yu Reference Yu1998; Hsu et al. Reference Hsu, Wang and Hu2015; Zhan Reference Zhan2017). However, a modal can take shuō and shì as its complements and collocation between ne and conditionals is rare. Ne is not attested in the corpora until Early Mandarin, where no conditional precedes ne immediately. In Modern Mandarin, only one instance does: rúguǒ ne ‘if um’, whose mutual information value of –1.84 (calculated by the corpus’ built-in function) suggests that rúguǒ and ne do not tend to co-occur.

Finally, a modalized protasis, which is marked by a modal and a conditional simultaneously, distinguishes between the two, e.g. (subject) if modal and if (subject) modal. Nevertheless, such occurrences are rare panchronically. A simple collexeme analysis (Stefanowitsch & Gries Reference Stefanowitsch and Gries2003) shows that throughout the history of Chinese, only possibility modals néng and nénggòu ‘be able to; can’ are significantly attracted to protases (i.e. they occur statistically more frequently than expected in protases), while the other modals are not. Tables 1 and 2 summarize the results of the analysis, by dividing modals into two kinds: whether they are attracted to or repelled from protases marked by ruò in Old Chinese (eighth–first centuries bce) and rúguǒ in Modern Mandarin, both of which are the most frequent conditionals in their respective periods. Attraction (or repulsion) indicates that they occur more (or less) frequently than expected. Collostructional strength > 1.30, a log-transformed number here, indicates p < .05 (Fisher’s exact test), i.e. attraction or repulsion is significant. ‘n’ is the raw frequency of a modal in protases^.

Table 1 Collostructional strength (CS) between modals and ruò in Old Chinese.

Table 2 Collostructional strength (CS) between modals and rúguǒ in Modern Mandarin.

Tables 1 and 2 suggest that néng and nénggòu are overwhelmingly represented in protases throughout the history of Chinese, but most modals are not significantly attracted. Therefore, although modals and conditionals have distinct distributions in modalized protases, such sequences are generally rare.Footnote ⁶

In sum, Chinese Modal and Conditional share distributional properties. One may be distinguished from the other in some distributional contexts (e.g. [if subject modal…]), but neither is uniquely associated with such contexts or occurs there consistently.

2.3.2 Functional similarities between Modal and Conditional

Both modals and conditionals represent propositions as non-factual (Narrog Reference Narrog2012), share similar types of readings (Sweetser Reference Sweetser1990), and have speech act uses (Akatsuka Reference Akatsuka, Brentari, Larson and MacLeod1992; Akatsuka & Clancy Reference Akatsuka, Clancy and Clancy1993). These similarities are shared between most modals and conditionals, unlike English Noun and Adjective, where shared similarities such as referentiality and gradability are more lexically specific. One formal semantic tradition especially highlights the interconnection between modals and conditionals. Kratzer (Reference Kratzer2012), building her analysis of conditionals on that of modals, proposes that conditionals function like modals: they restrict modal meanings by specifying what would otherwise be left inferred by modals. Kratzer (Reference Kratzer2012: 108) thus remarks: ‘There is no two-place if… then connective in the logical forms for natural languages. If-clauses are devices for restricting the domains of operators’. See Condoravdi & Lauer (Reference Condoravdi and Lauer2016) for a review.

Speech acts are central to Radical Construction Grammar: what speakers intend to do linguistically is the building block of grammar such that the three basic cross-linguistic categories, Noun, Verb, and Adjective, are hypothesized to originate from the communicative acts of referring, predicating, and modifying, respectively (Croft Reference Croft2001: 66). Following Radical Construction Grammar and on the basis of the dataset considered here, the most prominent functional similarity between Modal and Conditional is their speech act uses (i.e. performativity): both can be the heads of constructions that perform similar speech acts. That is, they are ‘performatively equivalent’. For example, (7a, b) are responses to the addressees’ questions about what to read. Both responses can be understood as directives, which, by Searle’s (Reference Searle1979: viii) definition, ‘get [people] to do things’; or specifically, as a speech act of advice (Searle Reference Searle1979: 13), in that they advise on what course of action to take.

Given that a modal utterance like (7a) and a conditional one like (7b) can be understood directively, an utterance without any morphosyntax specific to Modal or Conditional may thus sometimes be interpreted modally or conditionally in performative contexts. This is illustrated in the performative context of (8a), where xū can be understood as either a modal or a conditional; (8a) is where the pre-subject, conditional use of xū in (8b) originated (Kuo Reference Kuo2022a).

Performative uses of modal and conditional constructions are well known (e.g. Akatsuka Reference Akatsuka, Brentari, Larson and MacLeod1992; Akatsuka & Clancy Reference Akatsuka, Clancy and Clancy1993; Verstraete Reference Verstraete2001; Kaltenböck Reference Kaltenböck, Kaltenböck, Keizer and Lohmann2016). Such uses are typically labelled as indirect, in that they are less direct ways of performing speech acts. Performative verbs (I request that you do it) and imperatives ( do it!) may perform more direct acts. Performative equivalence between two expressions does not necessarily suggest that there is no functional distinction between them, as there are multiple ways of performing the same act, each of which likely has its own functional motivations. The distinction between directive and indirective acts also reflects the idea that the same act can be performed differently. For issues regarding variation and (in)direct acts, see Frajzyngier & Jirsa (Reference Frajzyngier and Jirsa2006) and Mauri & Sansó (Reference Mauri and Sansó2011).

Performative equivalence, in combination with distributional similarities, enables Modal and Conditional to be vague. A slot is vague between Modal and Conditional if it may be assigned both modal and conditional statuses and yet no difference in distribution or performativity suggests one status over the other. Other non-performative functional similarities may play a role, but, as far as the triclausal construction is concerned, performativity will be shown to be the most prominent function that provides the shared background against which its modal slot may be understood as morphosyntactically vague.

3.1 Introduction

In the following, (1), reproduced as (9), is a snapshot of the construction.

P ₁ is some goal that the speaker assumes someone (typically the addressee) wants to achieve. Q is modalized as the necessary means to achieve P ₁. modal is a teleological modal, which marks a proposition as necessary with respect to some goal (Narrog Reference Narrog2012: 8). then anaphorically refers to Q, signaling that P ₂ temporally follows or conditionally depends on Q; Q then P ₂ may be paraphrased as ‘after/if Q, P ₂’. This polysemy between temporality and conditionality is a general property of Chinese connectives (Li & Thompson Reference Li and Thompson1981: Ch. 23; Eifring Reference Eifring1995: Ch. 4) and typologically widespread (Traugott Reference Traugott and Haiman1985). P ₂ describes the result of Q and anaphorically refers to the goal described by P ₁, by containing one or more lexical items from P ₁ and/or a modal expressing the possibility of P ₁. P ₂ can be paraphrased as ‘P ₁ is possible’ and understood as referring to the same goal as P ₁ does. For example, in (10), P ₂ kě dǎ dé ‘can succeed in attacking’ contains kě ‘can’ and resembles P ₁ dǎ qīngzhōu ‘attack Qīngzhōu’.

The construction functions as a directive. First, it assumes the addressee’s goal (if wants P ₁ ‘if you want P ₁’); second, it indicates to the addressee what is to be done (modal Q ‘one must Q’), if P ₁ is the goal; and third, it expresses what happens after/if Q is achieved (then P ₂), which anaphorically refers to P ₁. It is more specifically an indirect directive: it does not categorically direct the addressee to do Q but phrases it as contingent on one’s desire to achieve P ₁.

The construction is a special type of the anankastic conditional construction (Condoravdi & Lauer Reference Condoravdi and Lauer2016), which has a desire predicate within its protasis (if wants P) and an apodosis modalized by a teleological modal (modal Q). The modal expresses the necessary precondition and means through which P comes true. The anankastic conditional construction, as in (11), typically directs the addressee to do Q, if they want P. A typical anankastic conditional construction is represented as [if wants P modal Q].

The form if wants P modal Q does not always have the anankastic conditional function. Consider (12), where Q is not the necessary means for P and the speaker does not direct the addressee to achieve P.

The triclausal construction resembles the anankastic conditional construction: if wants P ₁ presupposes the addressee’s desire and modal Q expresses how to achieve P ₁. Unlike the anankastic conditional construction, the triclausal construction has then P ₂, which refers anaphorically to P ₁.

3.2 then P₂

then is typically filled by connectives meaning ‘only then’ (He et al. Reference He, Ao, Wang, Meiqiao and Wang1985: 150, 501), e.g. shǐ in (3) and fāng in (2) and (10). Connectives meaning ‘then’ are also found, e.g. ránhòu in (13) and zé in (14). then is rarely unfilled, cf. (16).

Connectives in then anaphorically refer to the condition or time established by Q. Apodosis connectives alone may signal temporal or conditional relations without protasis connectives, so Q then P ₂ may mean ‘(only) after/if Q, P ₂’.

The connection between P ₁ and P ₂ is worth noting. Consider (15), (16), and (17):

In (15), P ₂ contains one word, dé ‘possible’ and is marked by the apodosis connective shǐ ‘only then’. P ₂ anaphorically refers to P ₁ in that the possibility it expresses pertains to P ₁, i.e. P ₂ means P ₁ ‘to go’ is possible. Shǐ P ₂ therefore can be interpreted as ‘(only after/if Q) is P ₁ possible’ within the context of the construction. In (16)–(17), P ₂ contains a possibility modal and/or a lexical item recycled from P ₁. In (16), P ₁ is pò zhèn ‘break up a tactical formation’ and P ₂ is kě pò ‘can break it up’. In (17), P ₂ dé míngbái ‘obtain clarity’ contains no possibility modal, but resembles P ₁ biàn míng ‘recognize clearly’.

P ₂ is discourse-old, as it refers to P ₁. It may reiterate one or more lexical items from P ₁ and a possibility modal that implies P ₁ is possible, e.g. (2), (10), (13), (16), and (17). Or it may contain such a possibility modal but no similarity to P ₁, e.g. (3), (14), and (15). The discourse-oldness of (18) is interestingly tautological: P ₁ qù suǒzài ‘go where it is’, Q qù dào ‘get there’, and P ₂ dé ‘it is possible’; so is that of (19): P ₁, dé nèndì ‘get so’ and P ₂, néng nèndì ‘can (do) so’.

As P ₂ refers to P ₁ without exception and then pertains to the condition or time established by Q, the function of then P ₂ is likely to emphasize Q as being the precondition and the necessary means to achieve P ₁/P ₂. The connection between P ₁ and P ₂ is non-predictable and qualifies the triclausal construction as a construction in the sense of Goldberg (Reference Goldberg1995) and Hilpert (Reference Hilpert2014); see Section 3.5 for more discussion.

3.3 modal Q

modal marks Q as teleologically necessary with respect to the realization of P ₁; (13)–(18) show that xū and xūshì occur in modal. Bì ‘must’ is another but rarer possibility. He et al. (Reference He, Ao, Wang, Meiqiao and Wang1985: 639) note that the strength of xū varies between bì ‘must’ and yīng ‘should’ and presumably so does its derivative xūshì. For consistency, xū(shì) is translated into ‘must’.

The status of xū + shì in (2), (13), (18), and (19) deserves particular attention. Etymologically shì is a copula. Depending on the context, xū + shì may be interpreted as a disyllabic modal (xūshì) or a sequence where xū modalizes the focus-marking copula shì that introduces a focalized element.Footnote ⁸ For example, following a subject and preceding a predicate, xū + shì is xūshì ‘must’, e.g. (20). Preceding a subject, xū + shì is xū shì ‘must be (the case that)’. Because no modal is assumed to be pre-subject, the subject suggests that shì is not part of a modal, e.g. (19).

In null-subject contexts, the distinction between xū shì and xūshì is less clear, e.g. (2), (13), and (18); (21) illustrates the possible distinction in the triclausal construction when null-subject. Translation (21a) assumes xūshì. (21b) assumes xū shì, where xū fills in modal, shì qù qǐng… fills in Q ‘(it) is (the case that) you go…; lit. be go ask’ and modal Q means ‘it must be the case that you go…’.

Xū + shì in modal Q, when not pre-subject, exhibits item-level vagueness. Using subscripts to indicate the types of filled slots, xū + shì can be assigned a modal analysis, if… xūshì _modal Q, as in (21a); or a modalized copula one, if… xū _modal shì… _Q, as in (21b). Yet no morphosyntax suggests which one is to be preferred and whichever it is does not alter the intended message: the whole construction constitutes a directive that advises ‘going and asking…’ (= Q), if one wants to ‘capture this demon’ (= P ₁). Both translations can perform this directive. Similarly, the intended speech acts in (2), (13), and (18) do not require a precise analysis of xū + shì; they essentially mean ‘Do Q, if you want P ₁/P ₂’. Readings of xū + shì in modal Q are thus performatively equivalent and their morphosyntactic statuses are vague, if no subject follows.Footnote ⁹

Furthermore, chúfēi, typically a conditional ‘only if’, also occurs in modal; (22) exemplifies a conditional construction [if Q then P] ‘only if Q, P’ with chúfēi in the if slot. The order of P and Q is reversed to highlight similarities to the corresponding triclausal slots (see Section 4.1 for more details).

Reproduced from (3), (23) illustrates the earliest instance of chúfēi in modal; (24)–(25) are later attestations. Translations (a) are modal readings of chúfēi analogically based on modals in the slot. Translations (b) are conditional readings modeled on chúfēi in the if slot of [if Q then P], where the sequence if want P ₁ modal Q then P ₂ is interpreted as if want P ₁ chúfēi _if Q then P ₂ ‘if you want P ₁ only if Q then P ₂’.

While Translations (b) are the most plausible original interpretations, chúfēi in this context is vague. It can be assigned a modal status, as an item in the modal slot in the triclausal construction (if… chúfēi _modal Q…) or a conditional status, as an item in the if slot in the conditional construction [if Q then P] preceded by another protasis (if…chúfēi _if Q…). No morphosyntax specific to Modal or Conditional indicates which analysis to select and whichever construction it is, there is no significant difference in the speech act being performed. The speaker (or the addressee) presumably does not need to choose an analysis to perform (or understand) the intended directive that they must do Q, if they want P ₁/P ₂.

In sum, xū + shì exhibits item-level vagueness between xū shì ‘must be (the case that)’ and xūshì ‘must’; and chúfēi, between ‘only if’ and ‘must’. One interpretation is performatively equivalent to the other and no category-specific morphosyntax suggests one over the other. Only when xū + shì in modal Q is pre-subject is it not vague, in which case it is xū shì. This non-vagueness is at the level of xū _modal shì… _Q. On the whole, the modal slot is morphosyntactically vague: both modal and conditional analyses are allowed and neither is enforced, due to distributional and functional similarities to Modal and Conditional. Crucially, the very first use of chúfēi in modal, (23), may be hypothesized as the source of subsequent modal uses. Furthermore, as chúfēi is vague between a modal and a conditional, in principle non-pre-subject xū + shì in the same slot may be vague, too. This will be explored in Section 4.

3.4 if wants

Some examples lack an explicit if. Clauses without any connective in Chinese may signal conditional or temporal relationships between clauses, the first one of which typically expresses the precondition or the temporally earlier event (e.g. Li & Thompson Reference Li and Thompson1981; Eifring Reference Eifring1995). wants P ₁ is also found in a clause marked by a temporal connective like shí ‘when’ alone, as in (16), or by both temporal and conditional connectives, e.g. (15). All cases but one contain wants. Yào consistently means ‘want’ in wants, but may be a modal ‘will/have to’ or a conditional ‘if’ elsewhere (Yu Reference Yu1998; Hsu et al. Reference Hsu, Wang and Hu2015).

3.5 Distribution and non-predictability of the construction

Table 3 describes the distribution of if, wants, modal, then, and whether P ₂ contains lexical similarity to P ₁ or no similarity but a possibility modal in Yǔlèi. Lexical similarity is defined as identity of form between parts or all of P ₁ and P ₂. Shí under if is an instance of shí ‘when’ without rú or ruò. Ránhòu under then includes the only one instance where multiple connectives mark P ₂.

Table 3 Distribution of the triclausal construction in Yǔlèi.

Rather than a construction with its own form and function, the triclausal construction could be a sequence of two independent constructions: an anankastic conditional construction [if wants P ₁ modal Q] and [then P ₂]; or an ‘insubordinate’ protasis [if wants P ₁] (i.e. a protasis used as a main clause) and a typical conditional [if Q then P ₂]. If true, two consequences follow. First, any triclausal sequence would result from the interaction of the two constructions, which supposedly could be predicted from elsewhere (e.g. general pragmatic principles). Second, possible multiple analyses of the modal slot would arise from the possibility that the sequence might be [if wants P ₁ modal Q] and [then P ₂] or [if wants P ₁] and [ if Q then P ₂]. However, the independent constructional status of the construction will be argued for.

Functionally, then P ₂ emphasizes Q as being the precondition and necessary means to achieve P ₁/P ₂ (Section 3.2). By hypothesis, lexical similarity between P ₁ and P ₂, in addition to the possibility modal, is instrumental in this emphatic function, as it explicitly creates coherence between P ₁ and P ₂. Such similarity is an aspect of the distributional preferences of the slots, which, if non-predictable, suggests the independent status of the construction.

Corpus work was undertaken to compare lexical similarity between P ₁ and P ₂ with a similar sequence from which lexical similarity presumably could be predicted, wants P _x modal Q _y then P _z. If the difference in likelihood of similarity was significant, similarity between P ₁ and P ₂ was assumed to be non-predictable. Instances of modal (xū, xū + shì, bì, and chúfēi) were examined if one of the ten preceding words was wants (yào or yù); ten is the limit of the filter function. The remaining 210 instances were then manually examined. An instance was counted as wants P _x modal Q _y then P _z if it was not the triclausal construction and if then referred to Q _y (to delimit the search range between modal and then; otherwise, any number of words could intervene); 16 were identified, out of which only two showed lexical similarity, e.g. (26)–(27). Compare 17 out of 32 in Table 3.Footnote ¹⁰

Lexical similarity between P ₁ and P ₂ is significantly more likely than between P _x and P _y (p = .011, φ = 0.392, using Fisher’s exact test), suggesting that it is non-predictable and construction-specific. A similar procedure was used to compare wants P _x (…) then P _z. 73 out of 287 showed similarity. Lexical similarity between P ₁ and P ₂ is again significantly more likely (p = .002, φ = 0.185, using Fisher’s exact test).

3.6 Summary

The components of the triclausal construction are summarized in (28)–(30).

The construction is an indirect directive: it frames the illocutionary act as contingent on the addressee’s desire. The directive function and the absence of morphosyntax specific to Modal or Conditional around the modal slot provide the background against which the slot is vague: it may be modal or conditional, the determination of which is not at issue, as both analyses are performatively equivalent. One communicative explanation for the vagueness is that the slot need not be specified, as the construction already specifies the relevant function: directivity.

4.1 Chúfēi: from Conditional to Modal

Section 4.1.1 introduces construction types involving chúfēi and Eifring’s (Reference Eifring1995) analysis of chúfēi as a non-conditional connective. Section 4.1.2 proposes that the pattern that motivates Eifring’s analysis is an anankastic conditional construction where chúfēi is a teleological modal. Section 4.1.3 proposes a diachronic account of modal chúfēi.

4.1.1 Construction types involving chúfēi

Chúfēi means ‘only if’ or ‘unless’. Following Yang (Reference Yang2007), these meanings are construction-dependent, as summarized in Table 4.

Table 4 Construction types involving chúfēi.

In Type 1, ‘only if Q, P’, the apodosis connective is typically cái ‘only then’ or one of its near-synonyms. This is the type that (22) instantiates. In Type 2, ‘unless Q, P’, the apodosis connective is fǒuzé ‘or; otherwise’, or one of its near-synonyms. Both types are illustrated in (31a, b).

Chúfēi occurs in more patterns than Table 4 suggests; for example, the chúfēi-marked protasis may be post-posed (Wang et al. Reference Wang, Chen, Teanor and Hsu2014). Despite its incompleteness, Table 4 captures the primary focuses of the literature on chúfēi: the meanings of ‘only if’ and ‘unless’ and its protasis-marking function.

A construction where chúfēi neither means ‘only if; unless’ nor marks the protasis is [if wants P chúfēi Q], as in (32), where wants is filled by verbs of desire (Eifring Reference Eifring1995).

Because chúfēi heads the apodosis in this construction, it is problematic for accounts treating it as exclusively a conditional. In the literature, this construction is either neglected or downplayed (Yang Reference Yang2007; Wang et al. Reference Wang, Chen, Teanor and Hsu2014), likely due to its low frequency in Modern Mandarin. According to Wang et al. (Reference Wang, Chen, Teanor and Hsu2014: 46), 1.9% of chúfēi in Spoken Chinese and 0.5% in Written Chinese are [if wants P chúfēi Q]. But it is more frequent in Early Mandarin: in texts between the fourteenth and eighteenth centuries in the corpus (from Shuǐhǔzhuàn to Qílùdēng), 32.9% (26/79) of chúfēi appears in [if wants P chúfēi Q].

To propose one function and one morphosyntactic label for chúfēi across the whole gamut of patterns, Eifring (Reference Eifring1995) proposes that chúfēi is a ‘necessity clause connective’ that marks its clausal complement as necessary (but not conditional) and any conditional meaning associated with chúfēi-marked patterns is attributed to the neighboring connective. Therefore, (31a, b) mean literally that Q is necessary (‘that you go is necessary’) and the conditionality originates from then and or (respectively, ‘only then will I go’ and ‘otherwise he will not go’). For Eifring, this analysis is not the same as analyzing chúfēi as a modal or a conditional protasis connective. First, chúfēi cannot be a modal, as it can be pre-subject, e.g. (31a, b). Second, chúfēi does not mark protases because if already does so in [if wants P chúfēi Q], e.g. (32). Because under Eifring’s analysis chúfēi is not a conditional protasis connective, (32) is not problematic. Instead, it means ‘if you do not want people to know, that you do not do it yourself is necessary’.

In sum, Eifring assumes chúfēi as functionally and morphosyntactically invariant across distributional contexts, which is a ‘no redundancy in representation’ linguistic analysis (Croft Reference Croft2001: 121). This leads to the conclusion that chúfēi is a necessity clause connective, not a modal or a conditional protasis connective.

4.1.2 Chúfēi as a teleological modal

Eifring’s analysis is problematic. No study seems to have uncovered any comparable non-conditional necessity clause type cross-linguistically. The analysis is thus ad hoc, positing a novel category based on a specific distributional pattern with no cross-linguistic near-equivalent. Furthermore, from a usage-based perspective, a non-redundancy analysis is not necessarily preferable or psychologically real (Croft Reference Croft2001: Ch. 3). Although chúfēi does not mark the protasis or mean ‘only if; unless’ in [if wants P chúfēi Q], it does not mean that it does not do so elsewhere; cf. Yang’s (Reference Yang2007) constructional approach to chúfēi.

To explain [if wants P chúfēi Q], it is necessary to consider the anankastic conditional construction, [if wants P modal Q]. All instances of [if wants P chúfēi Q] cited in the literature are anankastic conditional constructions: they direct someone to do Q if they want P and chúfēi marks Q as teleologically necessary for P. Lü (Reference Lü1999: 125) describes [if wants P chúfēi Q] as ‘(if) one wants to obtain a certain result ([i.e. result = P]), one must do so ([i.e. do so = Q]). Wang et al. (Reference Wang, Chen, Teanor and Hsu2014: 42) note that (32) is a common saying and translate chúfēi into ‘should’; (33) is another example.

Assuming modals as strictly post-subject, chúfēi in this construction, when pre-subject, is not a prototypical modal but a modal-conditional hybrid. Its pre-subject syntax suggests a conditional status; yet, by analogy with the anankastic conditional construction [if wants P modal Q], it resembles modals and expresses teleological modality. Analyzing something as a modal or conditional may be important in some theories, but presumably a user would only need to know that any instance of [if wants P chúfēi _modal Q] constitutes a directive where Q is the teleologically necessary means to achieve P. A precise analysis of chúfēi is not necessary. Furthermore, chúfēi in [if wants P chúfēi _modal Q] is not consistently pre-subject: only 34.6% (9/26) of the time is it so, based on texts between the fourteenth and eighteenth centuries. This means that most of the time, by analogy with [if wants P modal Q], chúfēi is a modal.

In sum, chúfēi is a teleological modal when in the modal position of the anankastic conditional construction, i.e. [if wants P chúfēi _modal Q]. This analysis is more desirable. First, it proposes no ad hoc clause type but draws on the anankastic conditional construction. Second, unlike Eifring’s analysis, it upholds the established analysis of chúfēi as a conditional in constructions described in Table 4. Only chúfēi in [if wants P chúfēi _modal Q] is a teleological modal.

4.1.3 The morphosyntactic history of chúfēi

Teleological modal chúfēi likely develops from its use in the triclausal construction, [if wants P ₁ modal Q then P ₂], which ultimately originates from its use in the Type 1 construction [if Q then P] ‘only if Q, P’, described in Table 4. It is hypothesized as a series of analogy-based changes, as instances of chúfēi in the following constructions are formally similar and performatively equivalent (the slots that chúfēi occurs in are in bold): [ if Q then P], [if wants P ₁ modal Q then P ₂] and [if wants P modal Q].

First, chúfēi in [if Q then P] is attested earlier than the other two uses. There are 5 such instances of chúfēi that are earlier than or contemporaneous with the earliest triclausal use of chúfēi, i.e. (23). All 5 are used directively, as in (22) and (34), where the speaker directs the addressee to do Q by saying that Q is the teleologically necessary precondition for the addressee’s goal, referred to by P.

Chúfēi in [if Q then P] up to and including Yǔlèi thus resembles the last two clauses in the triclausal construction (i.e. […modal Q then P ₂]), formally and functionally. This resemblance reflects the item-level vagueness of chúfēi in the triclausal construction (Section 3.3): a sequence like if wants P ₁ chúfēi Q then P ₂ can be interpreted as the triclausal construction (if… chúfēi _modal Q…) or a protasis and chúfēi _if Q then P (if… chúfēi _if Q…).

Second, chúfēi is attested in the triclausal construction earlier than in the anankastic conditional construction [if wants P modal Q], cf. (23) and (33). Because the first two clauses of the triclausal construction constitute the anankastic conditional construction, the occurrences of chúfēi in the latter are likely to have been motivated analogically by the former. Moreover, the modal positions in both constructions are teleological, so it is not unexpected that chúfēi started behaving like a modal after occurring in the triclausal construction, as in analogy ‘An item’s new syntactic behavior can be modeled on its behavior under a different syntactic status’ (De Smet Reference De Smet2012: 604).

Finally, whereas neither pre-Yǔlèi texts nor Yǔlèi contains chúfēi in the anankastic conditional construction, in post-Yǔlèi texts between the fourteenth and eighteenth centuries, 32.9% (26/79) of chúfēi occur in the anankastic conditional construction. This suggests chúfēi to have become more clearly modal after its occurrences in the triclausal construction.

The formal similarities between the constructions that chúfēi occurs in are visualized in (35). In (36)–(38), their semantics are summarized in (a), directive meanings in (b), and earliest attestations in (c).

In sum, a series of ‘analogically induced recategorization’ has likely led chúfēi to become a teleological modal. This change is likely enabled by the underdetermined morphosyntactic status of the triclausal modal slot, because chúfēi in the slot may be assigned a conditional status, in keeping with its origin, or a modal one, by analogy with other modals, which then gives rise to the teleological modal use.

4.2 Xūshì: from modal to conditional

Section 4.2.1 describes the history of xūshì. Section 4.2.2 summarizes the histories of xūshì and chúfēi and considers relevant details.

4.2.1 The morphosyntactic history of xūshì

Xū + shì originates from xū shì ‘must be’, e.g. (39) (Wu Reference Wu2004). Before Yǔlèi, xū + shì may be xū shì ‘must be’, xūshì ‘must’ or focus-marking xū shì ‘must be (the case that)’. It may be vague between the latter two, e.g. (40). These uses persist into Yǔlèi, e.g. (19), (20), and (41); (40)–(41) are anankastic conditional constructions.

Furthermore, in Yǔlèi xū + shì occurs in the triclausal modal slot for the first time and is vague in a way similar to (41), if not pre-subject (Section 3.3). As suggested at the end of Section 3.3, xūshì ‘only if’ is another possible interpretation, for which there are two supporting arguments. The primary one is that both xū + shì and chúfēi occur in modal. Therefore, if chúfēi may be analyzed as a modal or conditional, e.g. (23), so may xū + shì. The secondary one is that, although collocation with shì is not specific to Modal or Conditional, shì may be a bound component of a conditional (Section 2.3.1), which may nudge the status of the otherwise vague xū + shì towards that of a conditional. Reproduced from (18), (42) considers the possible interpretations of xū + shì: xū shì ‘must be (the case that)’, xūshì ‘must’ and xūshì ‘only if’.

In terms of performativity, not much seems to depend on the analysis of xū + shì. To understand (42), the addressee presumably would only need to know that the speaker intends to direct them to realize Q. The multiple analyses are also enabled by lack of category-specific morphosyntax (except if regarding shì as part of a conditional). One of the earliest instances of xū + shì as potentially xūshì ‘only if’ is (42); so are (2) and (13), all contemporaneous with the earliest vague instance of chúfēi, e.g. (23). Note that pre-subject xū + shì in the triclausal construction, e.g. (19), is not considered vague here, as such instances are xū shì ‘must be (the case that)’, assuming that no modal is pre-subject. If assuming otherwise, this means that the triclausal modal slot can be pre-subject and more cases of xū + shì will be vague between xūshì ‘must’ and xūshì ‘only if’.Footnote ¹¹

After Yǔlèi, xū + shì occurs in more conditional constructions, likely by analogy with chúfēi. Chúfēi in [if Q then P] is exemplified in (43)–(44); (45)–(46) are instances of xūshì in [if Q then P] that parallel chúfēi in (43)–(44). Xūshì in (45)–(46) is pre-subject, suggesting a clear conditional status. Xūshì _if and chúfēi _if are not as pragmatically specialized as pre-Yǔlèi chúfēi _if , i.e. (34), as shown in (44)–(45). In (44), P is not the speaker’s assumption of the addressee’s goal; (45) does not direct the addressee.

Whereas no xū + shì in pre-Yǔlèi texts is a conditional, xūshì ‘only if’ becomes comparatively more frequent between the fourteenth and eighteenth centuries; 29.9% (32/107) of xū + shì are in conditional constructions like (45)–(46), whereas 66.4% (71/107) are either xū shì ‘must be’ or xūshì ‘must’ and 3.7% (4/107) are triclausal.

In (47)–(49), mirroring (36)–(38), the history of xūshì, its semantics in (a), directive meaning in (b), and earliest attestations in (c), are summarized.

Note that item-level vagueness is common between stages: xū _modal shì _copula , and xūshì _modal in (41) and xū _modal shì _copula , xūshì _modal , and xūshì _if in (42).

4.2.2 Summary and other relevant aspects

Table 5 summarizes the slots that xūshì and chúfēi occur in diachronically in the Early Mandarin Corpus. ‘T.M.’ (for ‘teleological modal’) indicates the modal slot in the anankastic conditional construction [if wants P modal Q]; ‘triclausal’, the triclausal modal slot; and ‘conditional’, if in [if Q then P].

Table 5 Slots that xūshì and chúfēi occur in diachronically.

After appearing in the triclausal modal slot, xūshì becomes a conditional and chúfēi, a modal. The slot is vague: lack of category-specific morphosyntax and performative equivalence (i.e. distributional and functional similarities) render it underdetermined morphosyntactically, which likely enables the changes. Because it is vague, only occurrences in non-vague contexts, such as the slots in bold in [if wants P modal Q] and [ if Q then P], are unequivocal evidence that xūshì and chúfēi have changed. The analysis is limited by the relatively modest size of the Early Mandarin Corpus, where early instances of chúfēi are particularly scarce. Future research may gather more empirical evidence from a larger corpus to confirm or refute the analysis.

Finally, some relevant aspects of the changes are considered briefly. First, xūshì/xū shì ‘must (be)’ and chúfēi ‘only if’, being less frequent than other members of their categories, might be more susceptible to analogical change. Low-frequency items, compared with high-frequency ones, tend to be affected by analogy, due to weaker entrenchment in memory (Bybee Reference Bybee2010: Ch. 4). In Yǔlèi, the transitional period, xūshì/xū shì occurs 1,470 times (xū + shì is parsed as two words in the corpus), cf. kě ‘can’ (10,614) and néng ‘can’ (4,255); chúfēi occurs 7 times, cf. ruò ‘if’ (12,029) and rú ‘if’ (208). Second, the analysis is compatible with reanalysis-based approaches, e.g. invited inferencing (Traugott & Trousdale Reference Traugott and Trousdale2013) and context-induced reinterpretation (Heine Reference Heine, Wischer and Diewald2002). Such approaches would propose that inferences of conditionality (or modality) are invited in local contexts, particularly the triclausal modal slot. Third, pragmatic motivations likely underlie the changes. Directives are interactional and sensitive to interpersonal dynamics and vary in strength and other nuances; therefore, their origins are inherently pragmatic. For example, speakers may start using chúfēi in the triclausal construction and xūshì in the anankastic conditional construction to exploit their difference in illocutionary force (xūshì varies between ‘must’ and ‘should’; Section 3.3). For the emergence of directives across languages, see Mauri & Sansó (Reference Mauri and Sansó2011).

4.3 Coercion as an alternative

Coercion, whereby ‘the meaning of the lexical item conforms to the meaning of the structure in which it is embedded’ (Michaelis Reference Michaelis2004: 25) due to semantic incompatibility, may provide an alternative account. A conditional might be ‘coerced’ into having a modal meaning in the slot and by accommodating the conditional, the slot then became morphosyntactically vague. However, this assumes semantic incompatibility and an a priori morphosyntactic distinction that became vague only after coercion. This is problematic given, first, similarities between modality and conditionality (Section 2.3.2; especially Kratzer Reference Kratzer2012); second, the panchronic lack of consistent distributional distinctions between the categories; and third, the absence of category-specific morphosyntax in the triclausal construction. Ziegeler (Reference Ziegeler2007: 1023–2014) also remarks ‘the need to posit an a priori syntactic frame with which certain lexical items may be in conflict’ undermines the concept of coercion; see also Traugott & Trousdale (Reference Traugott and Trousdale2013: 206–207).

4.4 Similar changes

The occasional (34.6%) pre-subject position of chúfēi in the anankastic conditional construction (Section 4.1.2) is atypical of modals, which may cast doubt on bidirectionality between Modal and Conditional. The Early Mandarin Corpus also contains few pre-Yǔlèi instances of chúfēi, which may call into question its diachrony, represented in Table 5. Nevertheless, examples of the morphosyntactic developments, conditional > modal and modal > conditional, occur within and beyond Chinese.

The history of yào + shì resembles that of xū + shì: yào shì ‘will/have to be’ > yàoshì ‘will/have to’ > yàoshì ‘if’ (Hsu et al. Reference Hsu, Wang and Hu2015: 59). Yào by itself has undergone ‘will/have to’ > ‘if’ (Traugott Reference Traugott and Haiman1985: 291; Yu Reference Yu1998: 168; Hsu et al. Reference Hsu, Wang and Hu2015: 57). Note, however, in all instances of the triclausal and anankastic conditional constructions, yào is consistently a verb of desire (Section 3.4). Bì has also undergone ‘must’ > ‘(only) if’ (Kuo Reference Kuo2022c). Fēi is originally ‘unless’ in [fēi _if P bù kě] ‘unless P it is not good/possible’, as in (50), reproduced from (7b). From directive contexts such as (50), it has developed into a modal in [fēi _modal P] ‘must p’ in (51) (Kuo Reference Kuo2022a).Footnote ¹²

Modal > conditional occurs in various languages, e.g. Dutch and English in (52).

Japanese and Korean use conditionals to express modal meanings (Akatsuka & Clancy Reference Akatsuka, Clancy and Clancy1993), some types of which have turned into modals, especially in the spoken languages, exemplifying conditional > modal.

The development of (53) can be represented as [P-nai-to, ikenai] ‘if not P, it is bad > [P-nai-to] ‘must P’ (Fujii Reference Fujii, Fried and Östman2004), and that of (54), [P-(a)nakereba, naranai] ‘if not P, it is not good’ > [P-(a)nakereba (naranai)] ‘must P’ (Narrog Reference Narrog, Evans and Watanabe2016). Both resemble fēi: ‘unless P (it is not possible)’ > ‘must P’ and to a less extent, chúfēi: ‘(if you want P ₁) only if P ₂ (is P ₁ possible)’ > ‘(if you want P ₁) must P ₂’. Manchu and Turkic languages have similar expressions (Rentzsch Reference Rentzsch2012: 866).

Most changes reviewed here have not been attributed to morphosyntactic vagueness, but they support the likelihood of bidirectionality, including the morphosyntactic development of chúfēi, conditional > modal.Footnote ¹³