doesn't need和 needn't的分别

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doesn''tneed和needn''t的分别doesn''tneed和needn''t的分别doesn''tneed和needn''t的分别doesn''tneed中need是实意动词就是动词需要的意思need

doesn't need和 needn't的分别
doesn't need和 needn't的分别

doesn't need和 needn't的分别
doesn't need中need是实意动词 就是动词需要的意思
needn't中need是情态动词,跟can must有点像,也翻译成需要的意思

前者出现助动词,是实义动词,后者是情态动词,加动词原形

doesn't need是实意动词,便否定形式必须加助动词
needn't是情态动词,便否定形式,就直接在后面加not

用法是一样的
但是前面的doesn't need的need是做实意动词讲,后面那个need是做情态动词讲.

I am agree with the above answer

差别就在用法上
doesn't need to do sth
needn't do sth
但当need作情态动词时,就没有此用法