must have done 的反义疑问句怎么说
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must have done 的反义疑问句怎么说
must have done 的反义疑问句怎么说
must have done 的反义疑问句怎么说
当must后接完成式(即must + have + 过去分词),作“一定已经”讲,表示对过去的推测时:
a.若有表示过去的时间状语,则疑问部分用didn’t / wasn’t / weren’t提问.如 She must have been here yesterday,wasn’t she?/ You must have met her this morning,didn’t you?
b.若没有表示过去的时间状语,则疑问部分用haven’t / hasn’t提问.如 He must have been to Beijing,hasn’t he?/ The dogs must have eaten the food,haven’t they?
希望我的回答能够帮到你,
didn't 等+主语
用一般过去式
didn't ...
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