我是这样理解的 needn't是把need用作情态动词,后面直接跟动词原形或名词 don't/didn't need是把need作实义动词用,就像一般的及物动词,过去时中用did 两种形式是可以换用的 “真的不需要帮助”的表达,我个人如此用 I really don't need your help./I really needn't your help.
needn't do sth.中need表示情态动词 don't need sth中need表示实义动词
第3个回答 2007-07-14
needn't do sth.中need表示情态动词need后跟名词或者动词原形; don't need sth中need表示实义动词 我真的不需要你的帮助。 如果强调的是真的,翻译为:I really don't need your help. 如果强调地是不需要,翻译为:I really needn't your help.