情态动词＋动词完成式表示什么意思？

情态动词＋动词完成式

could have done “本来可以……”(过去有实现的可能但实际上没有做)

may/might have done “本来可能……；本来应该或可以做某事”(实际没有发生；含有轻微的责备语气)

should/ought to have done “本来该做某事”(而实际未做)

should not/ought not to have done “本来不该做”(实际上却做过了，含有责备语气)

needn't have done “本来不必做”(但是已经做过了)

must have done “一定做过某事”(表示对过去的肯定推测)，否定形式为can't have done

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