Structural linguists have focused on the morphological patternings of the Romance verb system, both from the point of view of systematizing variation and of mapping meaning on the form. Transformationalists, however, have tended to focus on the English auxiliaries. This book fills a gap in previous accounts by investigating the syntax of Romance verb-form usage, concerning both the verb itself and a simple sentence and such phenomena as sequence of tense in complex sentences. Adopting both a synchronic and diachronic perspective, and combining the approaches of structuralists and transformationalists, the author argues that there are still valid ideas to be drawn from the pre-Chomskyan concern with paradigmatic structure.