You might have given him more help, though you were busy.
4.could have done用于肯定句中,表示“可能已经……”的意义,也可以表示过去没有实现的可能性,意思为“本来可以……”。
例如:
You could have done better, but you were too careless.
I went to New York last summer and stayed at a hotel, but I could have stayed with my brother.
I saw his father just now. He couldn’t have gone to Shanghai.
5.should/ougt to have done用于肯定句时,表示本该做某事,但实际上没做;用于否定句时,则表示不该做的事反而做了。
例如:
You should/ ought to have come to the meeting earlier.
He ought not to have treated his parents like that.
6.needn’t have done表示本来不必去做的事但做了。但是didn’t need to表示”没有必要做而实际上也没有做”。
例如:
You needn’t have taken a taxi here, for it was very near to my house.
I didn’t need to clean the room.
My mother did it.
【锦囊妙计,战胜自我】
can…have done和can not have done表示对过去发生的行为的怀疑和不肯定。
例如:
He cannot have taken away the magazine.
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