情态动词。

　　(2)need作实义动词时，常接名词、代词和动词不定式作宾语。当need的主语和need后面的动词是被动关系时，need后面接to be done/doing。

　　(3)need作情态动词时，用于否定句和疑问句，后面接动词原形。

　　(4)回答Need I．..？肯定回答用：Yes，you must；否定回答用：No，you needn't/don't need to/don't have to。

　　三、情态动词＋have done的几种形式及其意义

　　1.

　　2.

　　It must have rained last night，for the ground is still wet.

　　昨晚肯定下雨了，因为地面还是湿的。(对过去的肯定推测)

　　I can't find my purse now.I might have left it in the taxi.

　　我的钱包现在找不到了。我可能把它忘在出租车里了。(对过去的推测，也许/或许做了某事)

　　You couldn't have known about him ten years ago，when he was still unknown.

　　十年前你不可能了解他，那时他还不出名。(对过去的推测，不可能做过某事)

　　You could have used my car yesterday.I didn't use it.

　　你昨天本可以用我的汽车。那时我用不着它。(过去本来能做某事，但没有做)

　　Oh，Mom！You needn't have prepared so much food.Dad and Diana will not come back for supper.

　　哦，妈妈！你本不必做这么多饭。爸爸和黛安娜不回来吃晚饭了。(过去不必做，但实际上做了)

　　Ⅰ.单句语法填空 【导学号：38300005】

1．It is obvious that the garden needs (water)．