Question

needn't 和 don't need 的区别

Answer 1

needn't
need在这里是情态动词,不必要.做MUST的否定句时用.

例如: MUST YOU GO WITH HIM?
NO, I NEED NOT.

翻译: 你必须跟他去吗?
不，我不必.

don't need
need 在这里是实意动词,不需要

例如: DO YOU NEED A PEN?
NO. I DON'T NEED. I HAVE A BALLPEN WITH ME.

翻译: 你需要钢笔吗?
不，不需要. 我身上有只圆珠笔.

Answer 2

needn't
do
接动词原形，此时为情态动词
don't
need
to
do接动词不定式，此时为动词

Answer 3

don't
need
是不需要什么东西。
needn't是没必要做什么事。

Answer 4

needn't 中need作为情态动词，这带有命令的口吻，而don't need 中need是行为动词

Answer 5

needn't=not necessary
do not need=mustn't