Must have done 一定做了某事,表肯定推测
should have done 应该做某事,却没做,表现在后悔或惋惜之情
shouldn't ..本不应该做,却做了..
needn't..不需要做,却做了..
could...本可能做,却没做..
couldn't...表示不可能做,却做了...（虚拟语气）
may...表示可能做了某事...
might...同上,可能性小一点,多用于过去时态...
must/should/shouldn't/needn't/could/couldn't/may/mought+have
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