有must/could/can/may/maight have been done吗

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有must/could/can/may/maight have been done吗
有must/could/can/may/maight have been done吗

有must/could/can/may/maight have been done吗
1.can,could 比 may,might的可能性大些.
can,could 之间的区别,和 may,might 之间的区别在于,虚拟句和过去时态用后者,表示的可能性比原词小,但大部分时候2者可以互换,不会产生歧义或者对表述造成干扰.
2.could have done,might have done 是过去完成时态,不知你问的“可能性”是何意.
例如,Do not point me with a gun ever!I could have been killed.意思是"以后别在用枪指着我了,会出人命的!" 意思是point me with a gun 这件事情已经发生过了,所以才说那时候会差点没命.
但是如果说 Do not point me with a gun,I can be killed.是警告,point me with a gun这件事还没有发生,只是说可能会出人命而已.
3.过去时态用 could,might.例子：If it wasn't you,I could have finished my job by now.如果不是因为你,我现在应该已经完成工作了!
could 表示有这个能力；而这个句子之所以不用might have finished my job,是因为might表示的可能性太小,没有足够的说服力去职责别人.

哈哈

may have done and could have done 区别

都有

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