Filling 1.They ______ go anywhere they wished. 2.You _________ go on those ships. 3.There _______ be any other foreigners. 4.We just ________ show our passports. 5.We ______ see the sun setting behind the white pagoda. could shouldn’t won’t had to could

Indicate an ability to do something use to give advice make a prediction about the future the past form of must the permission to do something could(1) shouldn’t won’t had to could(5) Modal Verb

Correction Correct the mistakes and say why. John shoulds go to school on time. At that time we thought we musted hand in our paper. You must to finish your homework in time. We don’t can be there tomorrow. They should may do that. should must can’t should / may

Observation Two eyes can see more than one. I am so strong that I can lift this stone. He said that Jack couldn’t finish his work in such a short time. Could you follow my step? He is only four, but he is able to read. She was able to do it without my help. Will you be able to come to my party tomorrow? 表能力 can could be able to 有时态变化

Observation You can go now. I won’t let you down. Could I say it in Chinese? May I know your name? Would you mind closing the door? Shall we dance? Might I have a word with you? 表许可,征询 意见 can, will could / may / would / shall / might

Observation There must be a mistake. You may walk ten miles without seeing a house. He might get there on time. It can be true. In those days few workers could support their families. 表可能性(猜 测) must may, might, can, could 肯定句

Observation Observation She can ’ t be serious. We couldn ’ t have done better. People may not pick flowers in this garden. She was afraid they might not like the idea. 表不可能(猜 测) can’t, couldn’t may not, might not 否定句

Observation mustn’t, shouldn’t had better not We mustn ’ t waste our time. They shouldn ’ t left so soon. You ’ d better not disturb him. 表禁 止

Observation You should do what your parents tell you. If you can ’ t finish the book by then, you must come and renew it. This is a lovely party, but we have to go because of the baby-sister. The bridge was not wide enough so that somebody had to give way. should, must have to 表义务 (应该) 有时态变化

can 和 be able to 1.can/could 表示能力，可能。 只用于现 在式和过去式 (could) 。 2.be able to 可以用于各种时态。 They will be able to tell you the news soon. 3. 用于过去时， could 常表示能够做某事, 事实上不一定去做 was / were able to 设法做成某事 相当于 managed to do sth. succeeded in doing sth. 1.can/could 表示能力，可能。 只用于现 在式和过去式 (could) 。 2.be able to 可以用于各种时态。 They will be able to tell you the news soon. 3. 用于过去时， could 常表示能够做某事, 事实上不一定去做 was / were able to 设法做成某事 相当于 managed to do sth. succeeded in doing sth.

He could swim across the English Channel. But he didn’t feel like it that day. Yesterday I was able to get home before the heavy rain.

表示允许或请求；没有把握的推测。 may 放在句首, 表示祝愿。 May God bless you! might 表示推测时, 不表示时态, 只是可能 性比 may 小。 He may/might be at home. They might be having a meeting, but I’m not sure. 表示允许或请求；没有把握的推测。 may 放在句首, 表示祝愿。 May God bless you! might 表示推测时, 不表示时态, 只是可能 性比 may 小。 He may/might be at home. They might be having a meeting, but I’m not sure. may 和 might

have to 和 must “ 必须 ” 1. have to 表示由于客观因素不得不做 must 表示说话人的主观意志, 看法 1.My brother was very ill, so I had to call the doctor in the middle of the night. 2.He said that they must work hard. 1.My brother was very ill, so I had to call the doctor in the middle of the night. 2.He said that they must work hard.

2. have to 有人称、数、时态的变化，而 must 只有一种形式。 He had to look after his sister yesterday. 3. 否定结构中 don’t have to 表示 “ 不必 ” mustn’t 表示 “ 禁止 ” You don’t have to tell him about it. 你没必要把此事告诉他。 You mustn’t tell him about it. 你一定不要把这件事告诉他。 2. have to 有人称、数、时态的变化，而 must 只有一种形式。 He had to look after his sister yesterday. 3. 否定结构中 don’t have to 表示 “ 不必 ” mustn’t 表示 “ 禁止 ” You don’t have to tell him about it. 你没必要把此事告诉他。 You mustn’t tell him about it. 你一定不要把这件事告诉他。

should 和 ought to 都为 “ 应该 ” 的意思，可用于各种人称。 ought to 着重表示客观要求，含有法律 上或道义上的责任。 should 往往表示说话者的主观意见，表 示一种必要性。 —Ought he to go? —Yes. I think he ought to. 表示要求，命令时，语气强弱 : should < had better < must should 和 ought to 都为 “ 应该 ” 的意思，可用于各种人称。 ought to 着重表示客观要求，含有法律 上或道义上的责任。 should 往往表示说话者的主观意见，表 示一种必要性。 —Ought he to go? —Yes. I think he ought to. 表示要求，命令时，语气强弱 : should < had better < must

would 和 used to 1 ） used to 表示过去与现在或过去某时与后 来的情况有不同，而 would 只表过去的情况。 People used to think that the earth was flat. She would go out for a walk in the morning when she was in the country. 2 ） used to 可表示过去习惯性的动作和经常 的状态， would 只表示过去习惯的动作。 He used to / would smoke while writing. She used to be fat.

need 和 dare 作为情态动词时，两者都主要用于疑问 句、否定句和条件句。 need 作实义动词时后面的不定式必须带 to ，而 dare 作实义动词用时, 后面的 to 时 常可以被省略。 need, want, require, worth （形容词） 后面接 doing 可以表示被动： need doing = need to be done 作为情态动词时，两者都主要用于疑问 句、否定句和条件句。 need 作实义动词时后面的不定式必须带 to ，而 dare 作实义动词用时, 后面的 to 时 常可以被省略。 need, want, require, worth （形容词） 后面接 doing 可以表示被动： need doing = need to be done

Practice 历年高考题 1.-- Mum, I’ve been studying English since 8 o’clock. ___ I go out and play with Tom for a while? -- No, I’m afraid not. Besides, it’s raining outside now. A. Can’tB. Wouldn’t C. May notD. Won’t 2.I ____ pay Tracy a visit, but I’m not sure whether I will have time this Sunday. A. shouldB. might C. wouldD. could

3.Children under 12 years of age in that country ____ be under adult supervision when in a public library. A. mustB. may C. canD. need 4.You ____ be tired – you’ve only been working for an hour. A. must notB. won’t C. can’tD. may not 5.You might just well tell the manufacturer that male customers _____ not like the design of the furniture. A. mustB. shall C. mayD. need

6.A left-luggage office is a place where bags _____ be left for a short time, especially at a railway station. A. should B. can C. must D. will 7.-- Excuse me, but I want to use your computer to type a report. -- You ____ have my computer if you don’t take care of it. A. shan’t B. might not C. needn’t D. shouldn’t

8. Hundreds of jobs ____ if the factory closes. A. lose B. will be lost C. are lost D. will lose 9. Rainforests ____ and burned at such a speed that they will disappear from the earth in the near future. A. cut B. are cut C. are being cut D. had been cut 10. The first use of atomic weapons was in 1945, and their power _____ increased enormously ever since. A. is B. was C. has been D. had been