情态动词can't have done 和couldn't have done 有什么区别吗对过去发生的事情否定猜测用can't have done 或couldn't have done ,两者有区别吗?比如 He can’t have gone to Beijing for I saw him a minute ago. 能换成He couldn
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情态动词can't have done 和couldn't have done 有什么区别吗
对过去发生的事情否定猜测用can't have done 或couldn't have done ,两者有区别吗?
比如 He can’t have gone to Beijing for I saw him a minute ago. 能换成He couldn’t have gone to Beijing for I saw him a minute ago.吗?
谢谢
can't have done(不可能做过)是must have done(一定做过)的否定形式.
couldn't have done(可能没做过)是may have done(有可能做过)的否定形式.
一般认为can't have done有80%以上的把握.而couldn't have done则委婉的多,只有50%左右的把握.
must do /can't do一定,肯定80%把握
may/could do/couldn't do有可能50%把握
might do/mightn't do也许大概差不多30%以下的把握
大意上是没有什么区别的,但是用could可以显现出你说话的时态为过去,也是一种相对can更委婉的表达
不能换。第一个句子错误
情态动词+have done
情态动词+have donemust have done/can't have doneshould have done/shouldn't have doneneed have done/needn't have donemay(might) have done/haven't donecould have done/couldn't have donewould have done/wouldn't have done如何用?我这样分正
情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done
“情态动词 have done ” 全面一些,
情态动词+have done地用法
情态动词+have done 完整用法讲解?
情态动词+have+done 的详细用法?
情态动词can't have done 和couldn't have done 有什么区别吗对过去发生的事情否定猜测用can't have done 或couldn't have done ,两者有区别吗?比如 He can’t have gone to Beijing for I saw him a minute ago. 能换成He couldn
can't是不是情态动词
情态动词加Have done用法每种情态动词加-have done的意思
can’t +have done
must have been done是什么被动语态如will be done是一般将来时被动语态,can be done是情态动词被动语态
情态动词can,have to,must用法
英语翻译只要是情态动词(not)+have done都是虚拟!
情态动词+have done是虚拟语气吗?
情态动词+have done的意义有哪些?
情态动词+ have done一定用于虚拟语气吗
情态动词can't的用法