3.　　　 Visitors mustn’t/can’t take photos here.　 4. Can you dance?

Language

1.　　　 They can’t read.　　 2.I must get up early.

5. a series of　 6. sound quality

6. Must we hurry up? Yes, _____________.

用can, can’t, must, mustn't完成对话

LI NA： (1) _______ you tell me a bit about computers, please?

SALESPERSON： Yes, of course I (2) _______. Computers (3) _______ be very useful machines.

　　　　　　　　 You (4) _______ save a lot of time with a computer.

LI NA ： I (5) _______ use a computer yet, so I (6) _______ buy an easy machine to learn it on. Is this one easy to use?

SALESPERSON： Oh, yes. They're all easy to use. You (7) _______ learn to use it with this book.

LI NA ： (8) _______ you teach me how to use it?

SALESPERSON ：Yes. But first, let me tell you the rules. It's OK to leave your computer on

　　　　　 when you're not using it. In fact, you (9) _______ leave it on all day if you want.

LI NA　 (10) _______ I really?

SALESPERSON ：Certainly. But you (11) _______ turn your computer on and off a lot because it's bad for it.

LI NA： What else (12) _______ I do?

SALESPERSON： You (13) _______ move your computer when it is running.

LI NA：What about the mouse and the keyboard (键盘)?

SALESPERSON： Of course. You (14) _______ move these.

5. May we watch a video? No, _____________.

4. May I look at this magazine? Yes, _____________.

3. Must I do my homework now? Yes, _____________.

2. Can you speak French? No, _____________.

1. Can we stay at the party until midnight? No, _____________.

2. You mustn't to smoke here.

用情态动词回答问题：