need意为“需要”，dare意为“敢”，二者都既可作情态动词也可作实义动词，一般在疑问句和否定句中作情态动词用，在肯定句中作实义动词用。

　　①—Need he go yesterday?

　　—No，he needn't.

　　②She dare not go out alone at night.

　　3.“情态动词＋have done”的用法

　　(1)“情态动词＋have done”表示推测

　　情态动词有can，could，may，might，must，其后跟have done，表示对已经发生或完成的情况的推测。can仅用在否定句及疑问句中；must仅用在肯定句中；may/might不用于疑问句中。

　　①There is nowhere to find them.Where can they have gone? You can't have seen her in her office last Friday；she's been out of town for two weeks. ②He is upset.He must have been punished. ③Tom may have passed the driving test，but I am not sure about it. ④He might not have gone out because the light's on. (2)“情态动词＋have done”表示虚拟语气 情态动词could，might，should，need(只用否定形式)等后接have done表示与事实相反的情况，一般意为“本……(事实却不这样)”。 ①Considering his ability，he could have done it better. ②He might have given you more help，even though he was busy. ③You should have told me earlier. I'm sorry，I shouldn't have been so rude to you. ④He needn't have gone to the station yesterday. 4.虚拟语气在非真实条件句中的用法

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