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needn't have done和didn't need to do 有什么不同?
needn't have done和didn't need to do 有什么不同?
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推荐答案 2008-12-29
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。
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第1个回答 2008-12-29
前者的NEED不作为情态动词考虑
后者的NEED因有need to do sth的形式,肯定是情态动词.
再者,前句的动词是need为实意动词
还有个区别就是前后的事态不同,前者是现在时(一般现在时)后者很明显是过去时
第2个回答 2008-12-30
词性不是很重要,要区分它们表达的意思,相同的是这两个短语都表示:“没有必要做…… ”
但是前者是完成时态,而后者是表示做了这个事,但并不一定完成了~~
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