“Grammaticalization,” to quote what is probably the best known definition of the term, “consists in the increase of the range of a morpheme advancing from a lexical to a grammatical or from a less grammatical to a more grammatical status, e.g., from a derivative formant to an inflectional one” (Kuryłowicz 1965:69). As far as studies of grammaticalization in English are concerned, the history of the modals has been the focus of considerable attention in recent years. Manfred Krug's (K's) book is an important new contribution to this area of ongoing research.