7. ---David, is that man your head teacher? ---It ______ be him. He’s the tallest in our school. But that man is short.
A. mustn’t B. can’t C. needn’t D. won’t
2 ---Are you going to Beijing by plane?
--- I am not sure. I ______ take a train.
Need
1.需要做.. need to do 2. needn’t 不必 You needn’t worry abou
情态动词复习
can, could
1) 表示能力（体力、知识、技能）。 Can you skate? 技能 Can you lift this heavy box? 体力 Mary can speak three languages. 知识 She could read poems when she was three.
2.---Could I go to the movie this weekend, Dad? ---Yes, you ______. But you have to come back before nine.
A. shall B. must C. need D. can
3. ---Is John coming by train? ---He should, but he ______ not. He likes driving his car.
8. John, you needn’t do your work today, you _____ do it tomorrow if you’re tired.
A. must B. may C. can’t
9. ---Are you going to Beijing by plane? --- So I am not sure. I ______ take a train.
可以
may, might
表示请求和允许 此时可与can互换 --May I smoke in this room? --Yes， you may. -- No, you can’t. 或 No，you mustn’t.
可以
must
1) 表示必须、必要。是说话人的主观看法 You must come in time. -- Must we hand in our exercise books today? -- Yes, you must. 必须 -- No, you needn’t. --No，you don’t have to .
过去的能力
能
2) 表示请求和允许
此时可与may互换
--Can/May I go now? --Yes, you can. --No, you can’t. --不， 不行 或 -- No, you mustn’t. -- 不， 不准 -- Could I come to see you tomorrow? (婉转语气， 不表过去时）
must 与 have to区别
must译为“必须” 而have to多表示客观存在的环境所限,即客观要求 (无奈)而为之，多译为“不得不干某事” I must clean the room because there are too dirty. （无人强迫） I have to leave school because my family is （无耐） poor now. If I buy that car, I’ll have to borrow some money.
表示推测、可能性
might---may---must 也许、 可能、 一定 1．He might be very busy now. 2．He may be very busy now. 3. He must be very busy now.
表示推测的否定形式只有can’t.
不可能或肯定不
1． You’re Tom’s good friend, so you _____ know what he likes best.
A. don’t B. didn’t C. needn’t D. can’t
6. ---Is your brother playing computer games, Ted? ---He ______ do that because the computer doesn’t work.
A. may not B. can’t C. mustn’t D. needn’t
A. must B. can C. may D. need
4.---Could I use your pen? ---Of course you _____.
A. must B. may C. can D. need
5. ---Will you stay here for dinner? ---Sorry, I ______. I have something important to do.
1) shall 用于第一人称，征求对方的意见。 shall I clean the room for you? 2）should 表示应该做… You shouldn‘t watch TV every day。
1. ---______ you play golf? ---No. But I can play table tennis. A. Can B. May C. Must D. Should
A. should B. may C. must D. will
10. ---_____ I swim in that river? ---No, you _______. It’s dangerous to swim in it.