Adam Ledgeway's research interests include the comparative history and morphosyntax of the Romance languages, Italian dialectology, Latin, Italo-Greek, syntactic theory, and linguistic change. His research is channelled towards bringing together traditional Romance philological scholarship with the insights of recent generative syntactic theory, and he has worked and published extensively on such topics as complementation, complementizer systems, auxiliary selection and split intransitivity, word order, configurationality, alignments, cliticization, clause structure, functional categories, verb movement, adjectival positions, agreement, negation, subjects, causatives, voice distinctions, finiteness, imperatives, the development of demonstrative and deictic systems, grammaticalisation, parameters, and language contact.