The phenomenon of unaccusativity is a central focus for the study of the complex properties of verb classes. The Unaccusative Hypothesis, first formulated in 1978, claimed that there are two classes of intransitive verbs, the unaccusative (Jill arrived) and the unergative or agentive (Jill sings). The hypothesis has provided a rich context for debating whether syntactic behaviour is semantically or lexically determined, the consequence of syntactic context, or a combination of these factors. No consensus has been reached. This book combines contemporary approaches to the subject with several papers that have achieved a significant status even though formally unpublished.

This book is an exploration of the syntax of external arguments in transitivity alternations from a cross-linguistic perspective. It focuses particularly on the causative/anticausative alternation, which the authors take to be a Voice alternation, and the formation of adjectival participles. The authors use data principally from English, German, and Greek to demonstrate that the presence of anticausative morphology does not have any truth-conditional effects, but that marked anticausatives involve more structure than their unmarked counterparts. This morphology is therefore argued to be associated with a semantically inert Voice head that the authors call 'expletive Voice'. The authors also propose that passive formation is not identical across languages, and that the distinction between target vs. result state participles is crucial in understanding the contribution of Voice in adjectival passives. The book provides the tools required to investigate the morphosyntactic structure of verbs and participles, and to identify the properties of verbal alternations across languages. It will be of interest to theoretical linguists from graduate level upwards, particularly those specializing in morphosyntax and typology.

This book is an exploration of the syntax of external arguments in transitivity alternations from a cross-linguistic perspective. It focuses particularly on the causative/anticausative alternation, which the authors take to be a Voice alternation, and the formation of adjectival participles. The authors use data principally from English, German, and Greek to demonstrate that the presence of anticausative morphology does not have any truth-conditional effects, but that marked anticausatives involve more structure than their unmarked counterparts. This morphology is therefore argued to be associated with a semantically inert Voice head that the authors call 'expletive Voice'. The authors also propose that passive formation is not identical across languages, and that the distinction between target vs. result state participles is crucial in understanding the contribution of Voice in adjectival passives. The book provides the tools required to investigate the morphosyntactic structure of verbs and participles, and to identify the properties of verbal alternations across languages. It will be of interest to theoretical linguists from graduate level upwards, particularly those specializing in morphosyntax and typology.

The phenomenon of unaccusativity is a central focus for the study of the complex properties of verb classes. The Unaccusative Hypothesis, first formulated in 1978, claimed that there are two classes of intransitive verbs, the unaccusative (Jill arrived) and the unergative or agentive (Jill sings). The hypothesis has provided a rich context for debating whether syntactic behaviour is semantically or lexically determined, the consequence of syntactic context, or a combination of these factors. No consensus has been reached. This book combines new approaches to the subject with several papers that have achieved a significant status even though formally unpublished. Among the issues the authors address are: the determination of the unaccusative class of verbs, the problem of unaccusativity diagnostics, the implications of special morphology for the structural representation of unaccusatives and the status of the external thematic role, the properties guiding the unergative versus unaccusative distinction in acquisition, and the properties of second-language lexicon.