Hi, I would say both the questions and answers are acceptable. I hesitate, just a little, about the questions. I think it's because, while the answers are very clearly just a 'passive definition', the questions seem to have a slightly more 'active' feel to them, like some person is actually studying something, sitting in a library, turning pages.
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Anonymous"Ergative" is the same as "unaccusative", isn't it?Yes you are right. But the term "unaccusative [intransitive] verbs" is a term commonly used to differentiate intransitive uses of ergative verbs from genuine intransitive verbs (=unergative [intransitive] verbs) like dance, jump, run, talk.