人教课标高一 必修 3

Unit 2

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 …

He could not believe his eyes.

Perhaps he should go to the library an

d find out.

He had better do some research!

Even though her customers might get t

hin after eating Yong Hui’s food …

They would become tired very quickly.

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 s

hould 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.

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 oug

htn’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?

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”。

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。

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

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 hav

e to,  否定回答要用 needn’t 或 don’t 

have to,  意思是“不必” ；

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。 )

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。

Mother is out, so I have to look after th

e 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 pr

esent.

他们目前没有必要买电脑。

The boss has given everyone a special hol

iday, 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。

─ 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 toC. 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。

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.

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.

Choose suitable modal verbs below to complete the following dialogues.

ought/oughtn’t to should/shouldn’t willmustn’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

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

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

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

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

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 201

1)A. should B. might C. mustn’t D. couldn’t

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 to5. — 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

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’t7. 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

8. When I was young, I was told that I ____ play with matches. ( 上海 2008 春 )

A. wouldn’t B. needn’tC. mustn’t D. daren’t9. — 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

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

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

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

must; oughtn’t to; don’t have to;

couldn’t;

mustn’t; needn’t; can’t; have to3. 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 d

ifficulties.

have to

mustn’t

must / have to

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

Homework

Finish Using

Structures on

Page 50 of

Workbook.