couldn't have done 和 can't have done 怎么区分?分别用在什么情况下啊?

如题所述

推荐答案 2021-07-22

can't have done (过去一定没做...)，是对过去推测的否定形式。例如: I saw her just now，she can't have gone to Beijing. 我刚才看见她的，她不可能去了北京。
couldn't have done是虚拟语气，表达与过去的事实相反。例如: If I hadn't been told，I couldn't have known this. 假如别人不告诉我，我就不会知道这件事。

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第1个回答 2021-07-22

主要区别在于：
1. couldn't have done不仅可以表示过去完成时的否定，还可以表示虚拟语态。
2. 而can't have done只是现在完成时的否定。

第2个回答 2021-07-22

表示不可能的时候，没什么区别，只是后面这个显得是刚不久的事情。
表示允许的时候，只能用后面这个。本回答被提问者采纳

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