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nEED not hAvE DonE

didn‘t need to do里need是普通动词,就是need本来的意思,(过去)没必要/不需要做某事 need not have done 里need是情态动词,意思是本来无必要做某事(却做了),本不该做某事 例如: He did not need to come early, so he came late. 他不需...

must have done的否定形式是can't have done. 用must来表示肯定、猜测;用can't 来表示动作不可能发生,如: - that must be wrong. - No, it can't be wrong. 过去式举例:He walked past me without speaking. He can't have seen me. couldn'...

1.He need not have done it. 他本不需要做这件事。 2.Yet they need not have done. 然而他们没有必要这样做。 3.You need not have done it. 你本来不必做此事。 4.I quitted smokinglast month, but I need not have done so.上个月我把烟戒...

should not have done / ought not to have done:表示过去本不应该做某事但事实上却做了。 need have done:表示过去本来有必要去做某事,但事实上没有做。 ...

should not have done / ought not to have done:表示过去本不应该做某事但事实上却做了。 need have done:表示过去本来有必要去做某事,但事实上没有做。 ...

should not have done / ought not to have done:表示过去本不应该做某事但事实上却做了。 need have done:表示过去本来有必要去做某事,但事实上没有做。 ...

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