can have done和could have done的区别是什么？

Answer 1

can have done和could have done有区别。

can't have done和couldn't have done有区别。

1.can+have+done表示对过去行为的怀疑,用于疑问句,译成“可能做过……吗?“

2.could+have+done是虚拟语气,表示对过去事情的假设,意思是本来能够做某事而没有做。

3.could (不能用 can) have done “表示“过去本能够做某事却未做。”注意：其否定形式 couldn't have done 没有虚拟语气的用法。

4.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。”

拓展资料：

can have done、could have done、can't have done、couldn't have done的例句：

1.Can she have done her homework? 

她可能做完家庭作业了吗？

2.Yes, perhaps I could have done better, but that's not what I want in life. 

是的或许我可以做得更好，但这是不是我要的生活。

3."She can't have done anything so stupid," she cried in distraction. 

“她这么做再愚蠢不过！”她心烦意乱地嚷道。

4.I couldn't have done any of this without Beatrice and mullet fingers. 

没有比阿特丽斯和红鲻我也做不到这些。