Abstract This book describes the historical emergence and spread of the to-infinitive in English. It shows that to + infinitive emerged from a reanalysis of the preposition to plus a deverbal nominalization, which spread first to purpose clauses, then to other non-finite environments. The book challenges the traditional reasoning that infinitives must have been nouns in Old English because they inflected for dative case and can follow prepositions. In fact, as early as Old English, the to-infinitive was established in most of the environments in which it is found today, and its syntactic behaviour clearly shows that it is already a clause rather than a phrase at this early date. Its spread was largely due to competition with finite subjunctive that-clauses, which it gradually replaced. Later chapters consider Middle English developments. The book provides a measured evaluation of the evidence that the infinitive marker to undergoes a period of degrammaticalization. It concludes that the extent to which to gains syntactic freedom in Middle English is due to the fact that speakers began to equate it with the modal verbs, and therefore to treat it syntactically as a modal verb. The rise of to-infinitival Exceptional Case-Marking constructions is a Middle English innovation, triggered by changes in information structure that were in turn caused by the loss of verb-second.
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