can have done的用法

如题所述

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。

温馨提示:答案为网友推荐,仅供参考
第1个回答  2023-08-24
"can have done"是一种情态动词的过去完成时,表示过去某个时间点或动作之前已经完成的动作。它是由“can”和“have done”两部分组成的。其中,“can”是情态动词,表示能力或许可;而“have done”是现在完成时的构成形式,表示过去某个时间点或动作之前已经完成的动作 。
例如:
- By the time I arrived, he could have finished his work.(到我到达的时候,他可能已经完成了他的工作。)
- She can have left already.(她可能已经离开了。)
相似回答