don't need to do 与needn't do 有什么区别?还有needn't 是否只能用于一般现在时?

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don't need to do 与needn't do 有什么区别?还有needn't 是否只能用于一般现在时?
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don't need to do 与needn't do 有什么区别?还有needn't 是否只能用于一般现在时?
don't need to do 与needn't do 有什么区别?
还有needn't 是否只能用于一般现在时?

don't need to do 与needn't do 有什么区别?还有needn't 是否只能用于一般现在时?
don't need to do 与needn't do 有什么区别?
有一定的区别:
don't need to do 这里need是个行为动词,而needn't中的need是情态动词;
needn't应该相当于don't have to 更好
还有needn't 是否只能用于一般现在时?
是的,一般只用于一般现在时,但在宾语从句中也可表示过去或将来(不太常见).

一般来说是没有区别的,只不过 ,第一个need 是使役动词,而第二个need 是情态动词