What can you see in the picture?

What can you see in the picture?

and find out Read If you want to cross a street, you must wait for the green light. You mustn’t cross in front of the traffic. If the light is yellow, you should wait. If you are not careful, a car may hit you. If you are in the UK, you have to drive on the left.

Modal Verbs 情态动词

情态动词 • 情态动词,顾名思义是用来表达感情和态度的动词。 • 表明说话人的立场和口气,以及说话想达到的目的 • 常用的情态动词有： can (could), may (might), must, have to, need, ought to, shall , should

can (could) • Some of us can use the computer now, but we couldn’t ten years ago. • Can/Could I borrow these books? • The story can not be true. 1）能，会：表示能力，相当于be able to (be able to 适用于任何时态)。 2）可以，表示许可，(may较正式，could较婉转） 3）可能，表示否定推测，can’t be 不可能

may (might) 1. ---May I watch TV after supper? --- Yes, you may. --- No, You may not / can’t. / You’d better not. No, you mustn’t. 1. ---May I watch TV after supper? --- Yes, you may. --- No, You may not / can’t. / You’d better not. No, you mustn’t. 2. If you are not careful, a car may hit you. • 可以，表示许可，相当于can. • (注意问句中的回答） • 2) 可能，或许，表示推测 • may be 可能

must • If you want to cross a street, you must wait for the green light. You mustn’t cross in front of the traffic. • --- Must I be home before 8 o’clock? --- Yes, you must. --- No, you needn’t / don’t have to. 3. There must be something wrong with my computer. • must: 必须；mustn’t: 不准，禁止 • 回答带有must的问句时，否定式常用needn’t 或don’t have to. • 3) 一定，表示肯定的猜测。（否定猜测用can’t）

have to • If you are in the UK, you have to drive on the left. • The animals we eat have to spend their lives living in tiny spaces. have to 不得不

I have to be at work at nine o’clock every day. • She has to work on Saturdays. • They’ll have to stay in a hotel. • Does Dick have to go to Beijing on business? • He didn’t have to go there last week. have to + 动词原形 • I have to be at work at nine o’clock every day. • She has to work on Saturdays. • They’ll have to stay in a hotel. • Does Dick have to go to Beijing on business? • He didn’t have to go there last week. have to 有人称、数、时态的变化当主语为第三人称单数时，用has to + 动词原形变问句或否定句时，需借助助动词。 not have to = needn’t

have to + 动词原形 • I have to be at work at nine o’clock every day. • She has to work on Saturdays. • They’ll have to stay in a hotel. • Does Dick have to go to Beijing on business? • He didn’t have to go there last week. have to 有人称、数、时态的变化当主语为第三人称单数时，用has to + 动词原形变问句或否定句时，需借助助动词。 not have to = needn’t

must 和have to 两者都表示必须 • must 侧重于说话者的主观看法，认为有必要或有义务去做某事； • have to 则重于表示外界客观需要，含有不得不或被迫之意 • I didn't take the raincoat with me yesterday. I____ wait for my father. A. have to B. has to C. had to D. must 2. Jack’s ill, so they ______ change their plans. A. must B. should C. have to D. ought to

need 作情态动词 1. I need type this letter again. 我需要重新录入将这封信. 2. There is enough time. You needn’t hurry. 有的是时间，你不必着急。

作行为动词+n. need 1). We need a great deal of money now. 我们需要很多钱。 2). They don’t need it any more. 他们不再需要它了。 3). Does your father need any help? 你爸爸需要帮助吗?

作行为动词+to +do need What do we need to take for the picnic? 野餐我们需要带些什么？ Will we need to show our passports? 我们需要出示护照吗？ You need to take good care of your mother. 你要好好照料你妈妈

need: 需要 1) 作情态动词 He need make a plan. 2) 作行为动词（有人称和数变化，后接名词/带to的动词不定式）。He needs to make a plan.

need的用法 1. ---Do we need _________ for the ticket to the park? --- No, we needn’t ___________ that. It’s free. • to pay, to do B. to pay, do C. pay, to do D. paying, doing 2. I don’t need __________ to school today. A. to go B. go C. going 3. Need he _________? No. he _________. A. to run, needn’t. B. run, doesn’t need. C. run, needn’t 4. Will Sam _________ tomorrow? A. need to leave B. need leave C. needs to leave

Summary can/could 1）能，会：表示能力 2）可以，表示许可 3）可能，表示推测 • may /might • 1)可以，表示许可 • 2) 可能，或许，表示推测 • must • must: 必须；mustn’t: 不准，禁止 • 回答带有must的问句时，否定式常用needn’t 或don’t have to. • 3) 一定，表示肯定的猜测。（否定猜测用can’t） have to 则重于表示外界客观需要，含有不得不或被迫之意 need 1) 作情态动词 2) 作行为动词（有人称和数变化，后接名词/带to的动词不定式）

Summary 注意回答形式： 1) May I…? Yes, you may. No, you can’t (mustn’t). 2) Must I …? Yes, you must. No, you needn’t.

Exercises: • –Can you lend me your MP3? • –Sorry, I __. My father has taken it with him. • A. mustn’t B. can’t • C. needn’t D. shouldn’t • 2. –Shall I go and meet you at the airport? • –No, thanks. I ________ take a taxi home. • A. need B. must C. should D. can • 3. –I can’t find Dad. Where is he? • –I’m not sure. He ____ be in the study. • A. must B. may C. need D. will • 4. All the passengers _____ wear seat belts on the plane. • A. can B. may C. will D. must

Exercises: • 5. –___ the exam paper be handed in right now? • –No, it doesn’t have to. You may hand it in before 11:30. • A. Can B. Must C. Should D. May • 6. –Must we get to the station before 6:00 ? • –No, you _____. The train leaves at 9:00. • A. mustn’t B. needn’t C. won’t D. can’t • 7. –Mary, ____ you speak Chinese? • –Yes, only a little. • A. must B. need C. may D. can • 8. –______ I come in ? • –Sure, come in, please. • A. Will B. May C. Must D. Need

Exercises: • 9. – ______ I use your mobile phone? • –Certainly. Here you are. • A. May B. Must C. Should D. Need • –May I put my bike here? • –No, you _____. Put it over there please. • A. needn’t B. won’t C. mustn’t D. wouldn’t • 11. –Having a blog (博客) _____ help me make more friends. • A. can B. must C. need D. should • 12. – _____I return the book next week? • –No, you needn’t. You can keep it if you like. • A. Can B. Must C. May D. Need

Exercises: • 13. –Must I hand in my exercise book after class? • –No, you _____. You may give it to me next Monday. • A. mustn’t B. needn’t C. may not D. can’t • –Must I finish the work in two days, Mr. White? • – ______. • A. Yes, you need. B. No, you mustn’t. • C. No, you needn’t D. Yes, you can • 15. –Mom, _______I play computer games? • –Yes, you can. But you have to finish your homework first. • A. must B. may C. will D. need

情态动词专练 1—5 C B D D A 6—10 A D D B D 11—15 D A A D B 16—20 B C D B B 21—25 A C D B A 26—30 C A B D D

What can you see in the picture?