情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done

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情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done
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情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done
情态动词+have done 用法及意义
must have done need have done daren't have done
could never have done could have done

情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done
must have done 一定做了某事(对过去的一种肯定推测)
need have done 本需要做某事(但实际没做)(表轻微的责备)
daren't have done = didn't dare do (过去)不敢做某事
could never have done不可能做了某事(对过去的一种否定推测)
could have done 本可以做某事(但实际没做) (表轻微的责备)

must have done 一定做过某事
need have done 本必须做,实际上没做