究竟can't have done与could't have done有什麼分别?有些人说是现在与过去的分别.有些人说是可能些较大和较小的分别.究竟是哪个才对?对不起,打错字了,是可能性。不是可能些。

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究竟can't have done与could't have done有什麼分别?有些人说是现在与过去的分别.有些人说是可能些较大和较小的分别.究竟是哪个才对?对不起,打错字了,是可能性。不是可能些。
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究竟can't have done与could't have done有什麼分别?有些人说是现在与过去的分别.有些人说是可能些较大和较小的分别.究竟是哪个才对?对不起,打错字了,是可能性。不是可能些。
究竟can't have done与could't have done有什麼分别?
有些人说是现在与过去的分别.
有些人说是可能些较大和较小的分别.
究竟是哪个才对?
对不起,打错字了,是可能性。不是可能些。

究竟can't have done与could't have done有什麼分别?有些人说是现在与过去的分别.有些人说是可能些较大和较小的分别.究竟是哪个才对?对不起,打错字了,是可能性。不是可能些。
I can't have done it without you
I couldn't have done it without you
第一位口语
第二比较书面的
意思是一模一样
你要是没有帮助我的话,我就无法完成(某事)

can't与couldn't确实有时态上的区别,但在这个结构中“情态动词+have+过去分词”,没有时态区别,因为此结构本身就已经是表示过去的了,所区别的就是后者语气更加客气和可能性更小了。

can现在,could过去(如果指现在可以表示委婉的口气)
现在与过去的分别;可能性较大和较小的分别---都对
1 如果不是用于虚拟语气,即,不是讨论与实际情况相反的情形,而是表示推测,可以用could/might/can/may/ must (可能性由小到大))+ 动词原形/ 动词完成式(have done表示已经完成); must这个意义时不能用于否定,否定用can't)))...

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can现在,could过去(如果指现在可以表示委婉的口气)
现在与过去的分别;可能性较大和较小的分别---都对
1 如果不是用于虚拟语气,即,不是讨论与实际情况相反的情形,而是表示推测,可以用could/might/can/may/ must (可能性由小到大))+ 动词原形/ 动词完成式(have done表示已经完成); must这个意义时不能用于否定,否定用can't)))
He left only 10 minutes ago. He can't /couldn't have arrived there by now. 则,差别在于can't可能性更小,couldn't更大/更委婉--他10分钟前才离开,现在绝对不可能/不太可能已经到达那儿了。
2 表示对已经发生的事情做与事实相反的推测,则只能用could/might
1楼错,只能说I couldn't have done it without you.多亏了你,不然,我不可能完成。
不能用can,因为我已经做了,是在你的帮助下做的,要假设没有你的帮助,必须用could have done,不能用can/may等现在形式。
如果还没有做,就可以用can,但是不会用完成形式: I can't do it without you. 没有你,我无法做。

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can现在,could过去(如果指现在可以表示委婉的口气)
现在与过去的分别;可能性较大和较小的分别---都对
1 如果不是用于虚拟语气,即,不是讨论与实际情况相反的情形,而是表示推测,可以用could/might/can/may/ must (可能性由小到大))+ 动词原形/ 动词完成式(have done表示已经完成); must这个意义时不能用于否定,否定用can't))...

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can现在,could过去(如果指现在可以表示委婉的口气)
现在与过去的分别;可能性较大和较小的分别---都对
1 如果不是用于虚拟语气,即,不是讨论与实际情况相反的情形,而是表示推测,可以用could/might/can/may/ must (可能性由小到大))+ 动词原形/ 动词完成式(have done表示已经完成); must这个意义时不能用于否定,否定用can't)))
He left only 10 minutes ago. He can't /couldn't have arrived there by now. 则,差别在于can't可能性更小,couldn't更大/更委婉--他10分钟前才离开,现在绝对不可能/不太可能已经到达那儿了。
2 表示对已经发生的事情做与事实相反的推测,则只能用could/might

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can’t +have done musn't have done can't have done用法区别 can't have done 的用法 究竟can't have done与could't have done有什麼分别?有些人说是现在与过去的分别.有些人说是可能些较大和较小的分别.究竟是哪个才对?对不起,打错字了,是可能性。不是可能些。 can't be和can't have done must have done,must do,can't have done,can't do的区别 can have done和could have done有无区别?can't have done和couldn't have done有无区别?如果有,区别是什么? mustn't have done和can't have done的区别最好有例子 could't have done和can't have done的区别 can't be done.should be done.should have done什么意思哈.. 关于英语ought to have done 与should have done的区别 有need have done needn,t have done 与should hneedn,t have done 与shouldn't have done 区别有need have done can have done could have done should have done should to do shouldn't have done shouldn't to do还有needn't have doneneedn't domustn't have donemay not have donemight not have done 用must have been/done或can*t have been/done 改写句子 can have ddone 与could have done 的区别在于? can't have been和can' have done有什么区别或者must have been和must hane done;may have been和may 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 needn't have done与shouldn't have done的区别? 有没有can have done sth?could have done sth有两种意思吗?can't/couldn't have done sth意思又是什么能不能举几个例子?