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  can't have done和couldn‘t have done 的区别

  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。ma...

  2024-08-20 网络 更多内容 354 ℃ 50
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  have done 和couldn\"t have done" target="_blank" >情态动词can\"t have done 和couldn\"t have done

  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m...

  2024-08-20 网络 更多内容 711 ℃ 326
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  mustn't have done和can't have done的区别最好有例子

  首先have done表示已经做过,这点就不用谈了. can't have done 表示以前不可能做某事. 例句 Where____Margaret have put the empty bottles? She________them away.They must be somewhere. A.can;can't have thrown B.must;must have thrown. C.must;needn't D.can;mus...

  2024-08-20 网络 更多内容 364 ℃ 562
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  can have done 是什么意思 用于什么情况???

  can have done 通常只用于疑问句和否定句;用于疑问句时表怀疑,用于否定句时表不确定。 例如: Can they have left so soon? 难道他们这么快就走了?(表怀疑) He can’t have been to that town. 他不可能去过那座城市。(表不确定) <><><> could have done 可用于肯定句、...

  2024-08-20 网络 更多内容 975 ℃ 500
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  can have done 是什么意思 用于什么情况???

  can have done 通常只用于疑问句和否定句;用于疑问句时表怀疑,用于否定句时表不确定。 例如: Can they have left so soon? 难道他们这么快就走了?(表怀疑) He can’t have been to that town. 他不可能去过那座城市。(表不确定) <><><> could have done 可用于肯...

  2024-08-20 网络 更多内容 377 ℃ 647
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  can have done 是什么意思 用于什么情况

  can/could have done 表推测一般用在否定句和疑问句中,表示不相信或怀疑的态度. Can/Could he have passed the exam?他可能通过了考试吗? I think that he couldn’t/can't have gone abroad.I saw him just now.我认为他不可能出国了.我刚才还看见他了. 注:表示推测过去某动作发生...

  2024-08-20 网络 更多内容 782 ℃ 411
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  can't have done是什么意思

  can have done 通常只用于疑问句和否定句;用于疑问句时表怀疑,用于否定句时表不确定。 例如: Can they have left so soon? 难道他们这么快就走了?(表怀疑) He can’t have been to that town. 他不可能去过那座城市。(表不确定) <><><> could have done 可用于肯定...

  2024-08-20 网络 更多内容 742 ℃ 950
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  wouldhavedone,mighthavedone,couldhavedone,shouldhavedone分别...

  ”4.could(不能用can)havedone表示“过去本能够做某事却未做。”注意:其否定形式couldn'thavedone没有虚拟语气的用法,couldn'thavedone只能表推测,相当于can'thavedone,意为:“过去不可能做了某事。”5.might(不能用may)havedone表示“过去本可以做某事却未做。”注意:其否定...

  2024-08-20 网络 更多内容 832 ℃ 342
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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...

  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. 我刚才看见衫蠢没她的,她不可或纳能去了北京。 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'...

  2024-08-20 网络 更多内容 227 ℃ 269
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  mustn't have done和can't have done的区别最好有例子

  首先have done表示已经做过,这点就不用谈了. can't have done 表示以前不可能做某事. 例句 Where____Margaret have put the empty bottles? She________them away.They must be somewhere. A.can;can't have thrown B.must;must have thrown. C.must;needn't D.can;must throw 答案为A.第...

  2024-08-20 网络 更多内容 458 ℃ 84