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（3）在肯定句中表推测。 a.This must be his pen. 这一定是他的笔。 b.They must be getting up now. 他们现在一定在起床。 （4）must have done表对过去肯定推测。 He must have read the book. 他一定看过那本书。 语 法 专 练 1.He must be writing, he? A.mustn’t B.can’t C.must D.isn’t 答案：D 2.“ he be watching TV now?”“Yes,he be watching TV now.”“No,he be watching TV now.” A.Must;can;mustn’t B.Can;must;can’t C.Can;can;mustn’t D.May;must;needn’t 答案：B 3.“ I open the window?”“Yes,please.” A.Does B.Shall C.Would D.Will 答案：B 4.“You your handbag in the cinema.”“No,it have been there.” A.leave;can’t B.have left;could C.leave;couldn’t D.have left;can’t 答案：D 5.—Tom hasn’t finished writing what he was saying. | 
