need后面不加TO的时候做情态动词讲,不需助动词改疑问或否定.结构：否定式：needn’t + 动词原形如：You needn't do it at once.need + 主语 + 动词原形＋其他 如：Need you do it by yourself?Dare 的用法与need 雷同
need to这里的need是做实义动词讲,需助动词改疑问或否定.
I don't need to do it to prove myself.
need 与need to有什么区别啊
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