需要某物,和需要做某事,都是用的need 的行为动词的用法.分别是need sth,need to do sth.
need当情态动词时,只用于疑问和否定句,后面只可以跟动词原形,不可跟名词.
如need i help you?You needn't come tomorrow.他们的否定式呢？need 作为行为动词时， don't need to do.need作为情态动词时，needn't do