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need 作实义动词 On the one hand, it can be used as an ordinary verb and has the same forms as an ordinary verb. The third person singular ends with an s, and questions and negatives are formed with do. As an ordinary verb, need is normally followed by an infinitive with to: 一方面，need可用作实义动词，此时它的用法跟其他动词一样：第三人称单数作主语时加s，疑问句和否定句用do来构成。做实义动词时，need一般接带to的不定式。例句： A: He needs to see a doctor. Do you need to see one too? A: 他要去看医生。你要去吗? B: No, I dont need to see a doctor. But I need a good rest. B: 不，我不需要看医生。但我要好好休息一下。 In this sense, when we are talking about necessity, we generally prefer need to / do not need to. 从这个角度讲，当我们谈论必须时，我们一般倾向于使用need to / do not need to(也就是将need作为实义动词用)。 need 作情态动词 In the other format, need behaves as a modal verb, like can, could, must, should, etc. It has the same forms as modal auxiliary verbs: the third person singular has no s, questions and negatives are made without do. In this format, need is followed by an infinitive without to: | 
