needn't和don't need在用法上有什么区别吗?大家帮帮忙,谢谢!

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needn't和don't need在用法上有什么区别吗?大家帮帮忙,谢谢!
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needn't和don't need在用法上有什么区别吗?大家帮帮忙,谢谢!
needn't和don't need在用法上有什么区别吗?
大家帮帮忙,谢谢!

needn't和don't need在用法上有什么区别吗?大家帮帮忙,谢谢!
need可以作为情态动词和实义动词.
所谓情态动词,就是如同can一样的,后面只能跟动词原形(DO STH).而它的否定形式也是同can一样,在后面加not,也就是needn't.
所以,needn't do sth是正确的.
实义动词,就如同want一样,后面跟不定式TO DO.它的否定是在前面加上don't,如don't want to do或don't need to do sth.
所以,在搞不清楚后面应该跟什么的时候,就用can和want来替换它,看后面应该是什么形式,这样就不会弄错了.

前者后面接动词原形， 后者后面接动词不定式 to do sth

needn't 在这里是情态动词的用法，后接动词原形，就像can't.
don't need 在这里作为一般动词， 后接不定式，to do,
就像don't want to ...

前者是情态动词。
后者是实义动词。

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