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Unaccusative verbs are a focus of second language acquisition research. Taking the second language acquisition of English unaccusative verbs as an example, this study first reviews the Unaccusative Hierarchy Hypothesis, the Unaccusative Trap Hypothesis and the Semantic Verb Class Hypothesis, which are exclusively concerned with the acquisition of unaccusative verbs. Then it examines the Entrenchment Hypothesis and the Interface Hypothesis, which address language acquisition in general, but sheddoi:10.17507/tpls.1006.05 fatcat:qqsn76fownguvafgkhxy26dbze