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nEED hAvE DonE 用法

needn't have done从用法上,是情态动词,didn't need to do是实义动词。 从意义上,needn't have done暗示已经做了,有“本不需要”的意思,didn't need to do暗示还没有做,就是纯粹地“不需要”。前者是过去将来时,后者是过去完成时。 具体区别...

need have done应该是表示本应该做某事却没有做,他的否定形式needn't have done 就是表示本没有必要做某事而做了。例如:You needn't have stayed.意思就是 你本没有必要留下来(实际却留下来了)。

不同之处为: needn't have done表示某件事没必要做却已经做了。表示已经做了这件事。 didn't need to do指在过去某件事不必做,是否做了不清楚。 例句: needn't have done 1、We spent a hell of a lot of money that we needn't have spent. ...

没有need have done这种说法,只有needn’t have done (没必要做某事但做了),表责备之意,这里的need属于情态动词。这种用法的结构是情态动词+完成时态。need有两种词性, 一个是做情态动词 ,一个是实义动词。 而need to do的need是实义动词...

need’t have done本来不必做……;wouldn’t do 不愿意做……。 1.You needn't have come so early. The meeting will begin in an hour. 2. I wouldn't give it up.

need have done应该是表示本应该做某事却没有做, 他的否定形式needn't have done 就是表示本没有必要做某事而做了. 例如:You needn't have stayed.意思就是 你本没有必要留下来(实际却留下来了).

有这个结构的

是本需要而没有做.

一、 “must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句。 1. It must have rained last night, for the ground is wet. 昨晚一定下雨了,因为地面还是湿的。 2. You must have been mad to speak to the serv...

区别解释: needn't have done表示某件事没必要做却已经做了。表示已经做了这件事。 didn't need to do指在过去某件事不必做,是否做了不清楚。 例句辨析: needn't have done 1、I needn't have bought al that wine-only three people came. ...

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