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In linguistics, an unaccusative verb is an intransitive verb whose syntactic argument is not a semantic agent; that is, it does not actively initiate, or is not actively responsible for, the action of the verb; or it treats the argument like the accusative argument of a transitive verb. Unaccusative verbs thus contrast with unergative verbs. An unaccusative verb's subject is semantically similar to the direct object of a transitive verb, or to the subject of a verb in the passive voice. English unaccusative verbs include ''die'' and ''fall'', but not ''run'' or ''resign'', which are unergative. They are called ''unaccusative'' because, although the subject has the semantic role of a patient, it is not assigned accusative case. In nominative–accusative languages, the accusative case, which marks the direct object of transitive verbs, usually represents the non-volitional argument (often the patient). But for unaccusative verbs, the subject is non-volitional and yet is not marked by the accusative. == Deriving unaccusativity == The derivation of the core properties of unaccusative constructions from a set of principles is one of the topmost issues of the agenda of modern syntax since the seminal work by Perlmutter 1978 (cf. Burzio 1986 and Hale-Keyser 2003 for landmark proposals). More specifically, the first approach arrived at an important consequence constituting an analogy between English passive voice constructions and unaccusative constructions whereas in the second approach a more radical theory was proposed based on the analysis of expletive ''there'' stemming from the sentences with the copula suggested in Moro 1997. From unaccusative constructions it is possible to derive unaccusative transitive constructions complete with ergative morphology: : → : → : weather again flipped → weather ERG again flip ate : 'The weather flipped again.' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Unaccusative verb」の詳細全文を読む スポンサード リンク
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