2. 人教课标 高一 必修 3 Unit 2

4. Find the sentences containing modal verbs in the reading passage.  Then usually by lunchtime they would all be sold.  What could have happened?  Nothing could be better …  Something terrible must have happened if …

5.  He could not believe his eyes.  Perhaps he should go to the library and find out.  He had better do some research!  Even though her customers might get thin after eating Yong Hui’s food …  They would become tired very quickly.

6. a. should, ought to 都可表示 “ 应该 ” 。 ought to 用于表示按道理应当，常指客 观的义务或责任，大多数情况下可用 should 代替，但比 should 语气重。 I should help her because she is in trouble. You ought to take care of the baby.

7. b. 表示劝告、建议或命令时， should 和 ought to 可通用，但在疑问句中常用 should 。 ought to 的否定式为 oughtn’t to 或 ought not to 。 You should / ought to go to class right away. Should I open the window? What should we do next?

8. c. should, ought to 都可表示推测。 He ought to / should be home by now. This is where the oil ought to / should be. should 和 ought to 后面跟动词不定式的完 成式, 其肯定句表示 “ 过去应该做而未做 ”, 其否定句则表示 “ 过去不该做但做了 ” 。

9. You should / ought to have made the decision a week ago. I shouldn’t have made such a foolish mistake. 多数情况下， ought to 可与 should 互 换使用。 ought to 的反意疑问句用 shouldn’t 替代。

10. You ought to have helped him with his English, ________? A. won’t you B. ought not you C. shouldn’t you D. wouldn’t you

11. 2. must 和 have to must 的用法 1) 表示主观的义务和必要, 主要用于肯 定句和疑问句, 意思为 “ 必须 …… ， 得 …… ，要 ……” ；由 must 引起的疑 问句，肯定回答要用 must 或 have to, 否定回答要用 needn’t 或 don’t have to, 意思是 “ 不必 ” ；

12. must 的否定形式 mustn’t 表示禁止， 意思是 “ 不能，不许 ” 。如： — Must I finish the task right now? 我现在必须完成这个工作吗？ — Yes, you must. / Yes, you have to. 是的。 (— No, you needn’t. / No, you don’t have to. 不，不必。 )

13. You mustn’t come here without permission. 未经允许，你不能来这儿。 have to 的用法 1) must 表示一种主观的需要，而 have to 表示一种客观的需要，意思是 “ 不得 不 ” 。 如： I have to attend an important meeting this afternoon. 今天下午我不得不参加 一个重要的会议。

14. Mother is out, so I have to look after the shop. 妈妈不在家，因此我不得不照看商店。 2) have to 的否定形式是 don’t have to, 相 当于 needn’t 。如： They don’t have to buy a computer at present. 他们目前没有必要买电脑。

15. The boss has given everyone a special holiday, so we ____ go to work tomorrow. A. can’t B. mustn’t C. needn’t D. shouldn’t 【点拨】考查情态动词。根据题意, 可知 这里表示 “ 没有必要 ”, 故只能选 C 项。

16. ─ What do you think we can do for our aged parents? ─ You ______ do anything except to be with them and be yourself. A. don’t have to B. oughtn’t to C. mustn’t D. can’t 【点拨】根据题意 “ 除了和他们呆在一起 做你自己外, 没有必要做任何事情。 ” 可 知这里选择 don’t have to 表示 “ 不必 ” 。 故选 A 项。

17. 3. must 和 need a.need 作情态动词时, 只能用于疑问句 和否定句。构成否定句和疑问句时不 借助于助动词 do 。 — Need I finish the work today? — Yes, you must. / No, you needn’t.

18. b. must 的肯定形式表示 “ 必须 ” ，否定 式表示 “ 禁止、严禁 ” 。 You must come here. You mustn’t take the book away from the library.

19. Choose suitable modal verbs below to complete the following dialogues. ought/oughtn’t to should/shouldn’t will mustn’t needn’t (don’t) have to can/can’t 1. Sam: How can I grow thinner, Mum? Mum: Well, you _______ eat food with plenty of fibre that helps you digest better. And you ______ stop drinking cola or eating sweet food. have to should

20. Sam: Does it mean I _________ eat my favourite fried chicken any more? Mum: Not exactly, if you love fried chicken, you ________ give it up. Just eat it less often. You ______________________________ worry too much: a little fried chicken ____ do you good! shouldn’t needn’t don’t have to/ needn’t/ shouldn’t will

21. 2. Doctor: You are sick because you’ve eaten poisonous mushrooms. Where did you get them? Lucy: I picked them in the forest. I know we _______ eat fresh vegetables. Doctor: Oh, but you _______ eat them until you’re sure they are not poisonous. Lucy: Thank you, doctor. I’ll be more careful next time. have to mustn’t

22. 3. Charles: I wish I could see things clearly in the dark. Tom: Eating carrots ________ help you see better. You _______ eat some every day. ought to should

23. 从 A 、 B 、 C 、 D 四个选项中，选出可以 填入空白处的最佳选项。 1. — I don’t really like James. Why did you invite him? — Don’t worry. He ______ come. He said he wasn’t certain what his plans were. ( 北京 2011) A. must not B. need not C. would not D. might not

24. 2. I ______ worry about my weekend — I always have my plans ready before it comes. ( 上海 2011) A. can’t B. mustn’t C. daren’t D. needn’t 3. — How’s your new babysitter? — We ______ ask for a better one. All our kids love her so much. ( 浙江 2011) A. should B. might C. mustn’t D. couldn’t

25. 4. You ______ buy a gift, but you can if you want to. ( 湖南 2010) A. must B. mustn’t C. have to D. don’t have to 5. — May I take this book out of the reading room? — No, you ______. You read it in here. ( 陕西 2010) A. mightn’t B. won’t C. needn’t D. mustn’t

26. 6. I ____ have watched that movie — it’ll give me horrible dreams. ( 山东 2010) A. shouldn’t B. needn’t C. couldn’t D. mustn’t 7. Mark ______ have hurried. After driving at top speed, he arrived half an hour early. ( 天津 2010) A. needn’t B. wouldn’t C. mustn’t D. couldn’t

27. 8. When I was young, I was told that I ____ play with matches. ( 上海 2008 春 ) A. wouldn’t B. needn’t C. mustn’t D. daren’t 9. — What sort of house do you want to have? Something big? — Well, it ______ be big — that’s not important. ( 陕西 2008) A. mustn’t B. needn’t C. can’t D. won’t

28. 10. — What do you think we can do for our aged parents? — You ______ do anything except to be with them and be yourself. ( 重庆 2007) A. don’t have to B. oughtn’t to C. mustn’t D. can’t

29. 11. The boss has given everyone a special holiday, so we _____ go to work tomorrow. ( 上海 2007 春 ) A. can’t B. mustn’t C. needn’t D. shouldn’t 12. Some aspects of a pilot’s job ____ be boring, and pilots often _____ work at inconvenient hours. ( 湖南 2006) A. can; have to B. may; can C. have to; may D. ought to; must

30. must; oughtn’t to; don’t have to; couldn’t; mustn’t; needn’t; can’t; have to 用所给的情态动词填空。 1. You _______________________ go on working because you look so tired now. 2. The weather turned out to be fine yesterday. I ________ have had the trouble to carry my umbrella with me. oughtn’t to / don’t have to needn’t

31. must; oughtn’t to; don’t have to; couldn’t; mustn’t; needn’t; can’t; have to 3. If you earn more than ￡ 5,000, you _______ pay tax. 4. You _______ play now! You shall finish your homework first! 5. I know things are hard with you, but you _____________ try to get over the difficulties. have to mustn’t must / have to

32. must; oughtn’t to; don’t have to; couldn’t; mustn’t; needn’t; can’t; have to 6. I didn’t see her at the meeting this morning; she ______________ have spoken at the meeting. couldn’t / can’t

33. Homework Finish Using Structures on Page 50 of Workbook.