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needn't have done和didn't need to do 有什么不同
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推荐答案 2015-11-24
动词的分类上,前者的need为情态动词,后者为实意动词.
意思上,前者表示某件事没必要做却已经做了,表示已经做了这件事；而后者只是主语在过去时表示某件事必不必要做,做了没有并不清楚.
didn't need to do 过去时 意思： 没必要去做某事 （事情还未做）
needn't have done 一般现在时 意思： 没必要做了某事 （事情已做好）
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do还有
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的区别
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didn
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to
表示过去不需要做，但是也许做了，也许没做，不确定
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have
done
表示过去不需要做的事已经做了
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needn
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