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couldn't have done的虚拟语气

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couldn't have done 和 can't have done 怎么区分?分别用在什么情况..._360问答

2021年7月22日 - can't have done(过去一定没做)是对过去推测的否定形式。couldn't have done(虚拟语气,表达与过去的事实相反)。 can't have done(过去...
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couldn't have done 是什么意思_沪江网校知识库

2018年12月27日 - t have done 没有虚拟语气的用法,couldn't have done 只能表推测,相当于 can't have done,意为: 过去不可能做了某事。 助助另外为同学补...
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