---Can I watch TV now? ---No, you .You________ do your homework first.A．

题型：不详难度：来源：

---Can I watch TV now?
---No, you .You________ do your homework first.

A．can; can

B．can’t ; must

C．can’t; can

D．must ; can

答案

解析

试题分析：以can引导的一般疑问的简略回答要用can，肯定性回答要用yes…can；否定性回答要用no，…can’t.can表示的是一种能力，意思是可以，能够等；而must表示必须，强调责任或义务或命令。根据语境的含义可知选择B。
点评：情态动词是一种本身有一定的词义，但要与动词原形及其被动语态一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。情态动词后面加动词原形。

举一反三

－Must I finish my composition (作文) right now?
－No, you _______.You can hand it in tomorrow.

A．can’t

B．mustn’t

C．needn’t

D．mayn’t

题型：不详难度：| 查看答案

—Where are Lucy and Lily?
—Oh , the two girls must _______ a game in the garden now.

A．play

B．are playing

C．played

D．be playing

题型：不详难度：| 查看答案

Mr Black be at home because she called me from England just now.

A．mustn"t

B．isn"t able to

C．can"t

D．may not

题型：不详难度：| 查看答案

This case is too heavy. Could you _____ me a favor?
A．to do B．doing C．do

题型：不详难度：| 查看答案

— Must we finish our homework today?
— No, you ________.
A．can’t B．mustn’t C．don’t have to

题型：不详难度：| 查看答案