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 N...