In Present-Day English, the particle out is obligatorily adjacent to the following of PP, as in He pulled the plugs out of his ears / *He pulled out the plugs of his ears, even though particles can normally precede or follow the object of the particle verb, as in Hepulled out the plugs / Hepulled the plugs out. Interestingly, in Old English and Middle English, the particle out could occur either adjacent or nonadjacent to the of PP. Based on corpus data covering the period from Old English to Late Modern English, I show that the change in the syntax of directional out of involves grammaticalization: The bleaching of the directional meaning of the preposition of led to a structural reanalysis by which the of PP became included in the particle's phrasal projection and could no longer be separated from the particle out. This in turn led to phono-logical reduction of the preposition of. The loss of the nonadjacent option is argued to be connected to the status of particles as optionally projecting elements.*

This article examines possible motivations for the choice of particle verb word order in Middle English (1100–1500) and Early Modern English (1500–1700). The word order alternation of Present-Day English particle verbs, which presents language users with a choice between verb–object–particle and verb–particle–object order, first emerged in Early Middle English (twelfth century). For Present-Day English, several studies (e.g. Gries 1999, 2003; Dehé 2002) have shown that the choice is influenced by a number of linguistic factors, such as the heaviness of the object (morphosyntactic factor) and the givenness of the object (discourse factor). This article reveals the influence of a number of morphosyntactic factors and also shows that the choice is increasingly influenced by the givenness of the object. The differences between Present-Day English on the one hand and Middle and Early Modern English on the other hand are discussed in the light of syntactic changes going on in these periods. It is argued that the developments in particle verb syntax are characterised by an increasing division of labour between the two word orders, which may also explain why both orders survive into Present-Day English.