no need 与 need not 的用法有什么区别?

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no need 与 need not 的用法有什么区别?
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no need 与 need not 的用法有什么区别?
no need 与 need not 的用法有什么区别?

no need 与 need not 的用法有什么区别?
no need是名词结构:There is no need for you to go if you are busy.
need not 是动词结构:You need not go if you don't want to.或者,You don't need to go if you don't want to.

第一个是名词,第二个是动词

no need “没有需要(必要)” 这里need 是名词;
need not “不必” 这里need 是情态动词, 否定句在need 后加not.