初中英语情态动词讲解-练习及答案

一、 考点、热点回顾 情态动词

【词汇辨析】

1. sometimes/ some times/sometime/ some time:

sometimes: “有时”=at times. He is sometimes late for school.

some times: “几次” I have been to Nanjing some times.

sometime: “某一时刻” I bought it sometime last spring.

We’ll meet again sometime next week.

some time: “一段时间” We have to stay here for some time.

2. many/ much/ a few/ a little/ few/ little

(1)many修饰可数名词,much修饰不可数名词;都表示许多。例如:

许多书 许多牛奶 (2)a few和a little都表示"有一点儿",侧重于肯定,相当于"some",但a few修饰可数名词,

a little修饰不可数名词,例如:

He has a few friends in London.

---Would you like some coffee?

---Yes, just a little.

(3)few和little表示"几乎没有",侧重否定。few后接可数名词,little后接不可数名词。例如:

He is a strange man. He has few words.

Hurry up, there is little time left.

【固定搭配】加-ing

be busy doing sth. 忙于做…… eg: Mother is busy cooking.

look forward to + doing sth. 期待做…… eg: Tom looks forward to seeing his father again.

Thank you for (doing) sth. 为了…感谢你 eg: Thank you for your help.

愉快地做某事 eg: I had great fun playing in the water.

=have a good time doing sth eg: I had a good time playing in the water.

做某事有困难

eg: I have difficulty finishing my homework in 2 hours.

【情态动词】 又叫情态助动词。它们具有以下特点:

⑴ 它们必须与其他动词连用,即:情态动词+动词原形

表示说话人对所述动作的看法,如需要、可能、意愿或怀疑等。

⑵ 绝大多数情态动词没有人称和数的变化,即第三人称单数不加-s

(以be和have 开头的情态动词短语除外)。

⑶ 在意义上,情态动词具有“多义性”。

例:can既可表示能力,又可表示可能、允许等意义。

【情态动词的基本用法】

1. can的基本用法:

⑴ 表示体力或智力上的能力,即“能够,会”,可与be able to转换。

例:He can speak English. = He is able to speak English.

—Can you play basketball?

— No, I can’t.

如果表示将来具备的能力,要用will be able to。

例:If I have a good sleep, I will be able to do the problem.

⑵ 表示许可,主要用于口语,书面语一般用may。

例:—Can we go home now, please?

— No, you can’t.

You can only smoke in this room.

You can’t keep the library books for more than a month.

⑶ 表示“可能”,与may同义,但一般用在疑问句中。

例:What can he possibly want?

在否定句中,否定形式can’t表示推测“不大可能”。

例:Anybody can make mistakes.

The news can’t be true.

与第一、二人称连用时,还可以就可能的解决问题的方式或可能的行为提出建议。在这里,也可用could使语气婉转。

例:Can / Could we meet again next week? 下周我们可以再见面吗?

—What shall we do? 我们怎么办呢?

— We can / could try asking Lucy for help. ——我们可以请露茜帮忙试试看。

You can / could help me with the cooking. 你可以帮我做饭。

2. may的基本用法:

⑴ 表示“许可”,用can比较口语化。

例:You may / can come if you wish. 如果你想来,你就来。

You may not pick flowers in this park. 本公园内不许摘花。

表示按规定不许可,如果用mustn’t则表示说话人不许可。)

我可以在这里抽烟吗?

mustn’t表示明确的禁止。)

⑵ ”。

例:It may rain tomorrow. 明天可能会下雨。

注意:如果“可能”

例:那会是真的吗?

他究竟是谁呢?

⑶ 【注意】:

——No3. must的基本用法:

⑴ 表示必须,强调说话人的主观意志。

例:I must go now, or I’ll be late.

ten o’clock.

【注意】:表示“必须“

时,must的否定式为,而不是mustn’t。

也就是:—Must

——例:——

⑵ 表示推测,一般只用于肯定陈述句,表示非常肯定。

例:She didn’t look at me. She must be angry. 她不朝我看,一定是生气了。

He is good at English. He must know the word. 他英语好,准知道这个词。

You must be Mr. Jones. 想必您就是琼斯先生吧。

4. have to的基本用法:

have to可视为情态动词,但它与其他情态动词在用法上稍有不同。其他情态动词没有人称和数的变化,而

have to却有人称和数的变化,要视主语的不同而变化。

例:I / You / We / They have to….

He / She / It to….

You don’t to….

“必须,不得不”。

强调主观需要

have to强调客观需要。

例:Sorry, I have to leave now. 对不起,现在我得走了。

Igo to a meeting. 我得去参加一个会议。

Will hework deep into the night? 他将不得不工作到深夜吗?

5. need的基本用法:

need的基本词义是“需要”,它既可作情态动词,又可作实义动词。

⑴ need用作情态动词时,只用于否定句和疑问句。它只有一种形式,后接动词原形。

例:I don’t believe you need worry. 我相信你没有必要焦急。

—Need we go so soon? 我们需要这么早就去吗?

— Yes, we . / No, we 是的,必须。/不,不必。

So I needn’t tell him, need I? 所以我不需要告诉他,对吧?

请比较以下两句话的不同意思:

你没有必要买那件外衣。(你还没买)

You 你没有必要买这件外衣的。(而你却买了)

My watch needs . 我的手表需要修理了。

We don’t need to work today. (= We needn’t work today.)

Does he need to go right now? (= Need he go right now?)

6. had better的基本用法:

to的动词不定式。

You’d better not

do that again. 你最好别再做那件事。

What had we better do now? 我们现在怎么做才好呢?

Hadn’t7. could, should, would, might表示推测:

①. must多用于肯定句中表示把握性极大的推测,意思为“一定、肯定”。

如: You have worked hard all day. You must be tired. 你已辛苦工作一整天了,一定累了。

The book must be his. His name is on the cover. 这本书一定是他的,封面上写着他的名字。

【注意】 must不表推测时,在肯定句中意思为“

必须(强调内在的职责)”,在否定句中意思为“不许、禁止”,以它开头的疑问句否定回答常用

needn’t或don’t (doesn’t) have to。

如:We must obey the traffic rules. 我们必须遵守交通规则。

Cars mustn’t be parked here. 此处严禁停车。

—Must we hand in the papers this week? 我们必须本星期交论文吗?

—No, you needn’t. 不,你们不必(本星期交)。

②或感叹句中表示推测、怀疑,两者在时间上没有差别。用can时不相信的程度更强一些,

如Tom. He’s gone to England. 这个人不可能是Tom,他已经去英国了。

Can it be true that he was fooled by a five-year-old boy? 他被一个五岁的孩子愚弄了,这能是真的吗?

Could this be an excuse? 这会不会是个借口?

How can you be so careless! 你怎么这样粗心!

③意思为“也许、可能”, might比may的把握性更小一些。

“不可能”与“可能不”在把握性大小上的差异。)

如may umber.王先生也许知道李教授的电话号码。

This 这可能就是汤姆一直在找的钥匙。

She 今天她可能不在那儿。 二、 典型例题 【中考链接】

( )1.—Who is the man over there? Is it Mr. Li?

— No, it ______ be him. Mr. Li is much taller.

A. mustn’t B. may no C. can’t D. needn’t

( )2.—Must I go with them tomorrow?

— No,

A. mustn't B. shouldn't C. needn't D. can't

( )3.—______ I take some photos in the hall?

— No, you ______.

A. Can, needn’t B. Must, mustn’t C. Could, won’t D. May, mustn’t

( )4.—Dad, must I finish my homework today?

—No, you ________. You may do it tomorrow.

A. needn’t B. mustn’t C. don’t D. won’t

( )5.—The lake is said to be dry. Is that true?

—It _______.Look, some kids are swimming in it.

A. must be true B. can’t be true C. may not be true

( )6.—What is your mother going to do this Saturday?

—I’m not sure. She _____ go to see my grandmother.

A. can B. must C. may

( )7.—Susan has bought a large house with a swimming pool.

—It ______ be very expensive. I never even dream about it.

A. must B. might C. can’t D. shouldn’t

( )8.—Listen! Is Professor Johnson giving a report in the hall?

—No, it be him. He has gone to Japan.

A. needn’t B. may not C. mustn’t D. can’t

( )9.—Let’s go to the West Hill Park by taxi.

—Oh, it is not far away from here. We _______take a taxi.

A. couldn’t B. mustn’t C. needn’t D. can’t

( )10.—Can you play the piano?

—Yes, I _______. I often practice it on weekends.

A. needn’t B. need C. can’t D. can

三、课后练习

一、用can, may, must, need, have to, had better的适当形式填空:

1. You ________________ return the library book on time.

2. I ______________ (not) find the way to the hospital. _______________ you show me the way?

3. —________________ I finish the work right now?

— No, you ________________ (not). You ____________ do it later.

4. He said he ________________ (not) come tonight.

5. Her mother was ill. She ________________ stay at home and look after her.

6. It’s time for class. You ________________ stop playing football or you __________be late for class.

7. We ________________ start right now, or they would get there first.

8. The cloud is lifting, so it ________________ (not) be a rainy day tomorrow.

二、选择填空

( )1.—Do we have to finish our homework this afternoon?

—Yes, you ________.

A. must B. can C. may D. need

( )2. —Must I be in hospital for a week, Doctor? 

—No, you 

A. mustn’t B. needn’t C. must

( )3. The desk is not dirty. You _______clean it.

A. mustn’t B. shouldn’t C. needn’t C. can’t

( )4. —May I watch TV for a while?

—No, you _______. You have to finish your homework first.

A. shouldn’t B. needn’t C. mustn’t D. won’t

( )5.—Is Jessica giving us a speech this evening?

—No, it ________be her. She________ to Japan.

A. mustn’t; has gone B. mustn’t ;has been C. can’t ;has gone D. can’t ;has been

( )6. It’s the library! So you________ know shouting is not allowed here.

A. can B. must C. need D. may

( )7. Boys and girls, don’t forget your report . It ______ today.

A. can’t finish B. can’t be finished C. should finish D. should be finished

( )8.—Mr Smith must have been to your home this morning.

—No, he ______ ,because he didn’t know my address.

A. couldn’t B. can’t C. mustn’t D. may not

( )9. —Must I mop up the window now?

—No, you________.

A. needn’t B. can’t C. shouldn’t D. mustn’t

( )10. —Is Lucy knocking at the door?

—No. It ________ be Lucy. She is in Japan now.

A. needn’t B. must C. can’t

( )11. —Another cup of coffee?

—No, thanks. I _____ be off. Mary is waiting for me.

A. can B. may C. must D. might

( )12. —I’m a little tired. Let’s go to the zoo by taxi.

—We take a taxi. It’s not far from here.

A. can’t B. mustn’t C. couldn’t D. needn’t

( )13. If the traffic light is red, you ________ cross the road. It’s very dangerous.

A. don’t B. mustn’t C. needn’t D. wouldn’t

( )14. —Must I finish watering the flowers now?

—No, you________.

A. must B. won’t C. needn’t D. can’t

( )15. —I can’t give up smoking, doctor.

—For your health, I’m afraid you ________.

A. may B. can C. have to D. must

( )16. It is usually warm in my hometown in March, but it _______ be rather cold sometimes.

A. must B. can C. should D. would

( )17. —Our class won the English speaking contest.

—Congratulations! You _______ be very proud of it.

A. can B. need C. would D. must

( )18. —Excuse me, where are we going to have our class meeting?

—I’m not sure. Ask our monitor, please. He know.

A. can B. may C. need D. shall

( )19. —____________I borrow these magazines?

—Sorry, only the magazines over there can be borrowed.

A. Must B. Would C. May D. Need

( )20. If the traffic light is red, you ________ cross the road. It’s dangerous.

A. don’t B. needn’t C. mustn’t D. wouldn’t

情态动词

典型例题

例1答案 C 分析:表示否定的猜测用can’t 。must表示推测时,意为“一定”,只能用于肯定句,而must的否定must not(mustn't)表示“不应该”、“不许可”、“不准”、“禁止”等。

例2答案 C 分析:在回答带有must的问句时,否定式常用need not (= needn't),表示“不必”,而不用must not,因为must not表示“不可以”。

例3答案 D 分析:本题第一句是请求对方的允许,需要用May,其否定式为mustn’t。

例4答案A。对于以情态动词must提问的疑问句,否定回答要用“No, 主语+needn’t”,故由问句中的must和答句中的No可选A。

例5答案B

例6答案 C

例7答案A 考查情态动词must表示肯定的推测。结合关键信息“I never even dream about it.”可知题意为“它肯定是非常贵的”,故排除B、C、D三项。

例8选D。本题考查can’t表示否定的推测。四个选项都是情态动词的否定形式,分别意为“不能;不可能”、“千万不能”、“应该”、“可以;可能”。结合关键信息“He has gone to Japan.”可知“他不可能是约翰教授”应选D。 例9选C

例10选D。以can 引导的一般疑问句再作肯定回答时还是用can。

课后练习

一、1. must 2. can’t, Could 3. Must, needn’t, may 4. couldn’t 5. had to 6. must, may 7. had better 8. can’t

二、 1A2B3C4选C。对于情态动词may的一般疑问句的肯定回答为:Yes,you may / can . 否定回答为:No, you mustn’t.5C6B7D8A9A

10选C。考查情态动词can’t表示推测的用法。can’t表示否定的推测;must表示肯定的推测。由题意“不可能是露西,她现在在日本”可知应选C。

11选C。考查情态动词must的用法。结合关键信息“Mary is waiting for me.”可知题意为“我必须离开了”,故排除A、B、D三项,选C。

12选D。四个选项都是情态动词的否定式,结合关键信息“It’s not far from here.”可知“我们不必乘出租车”,故排除A、B、C三项,选D。

13选B。考查情态动词mustn’t的用法。mustn’t意为“一定不能”,由“很危险”可知用mustn’t,故选B。

14选C。考查对must开头的一般疑问句的回答。以must开头的一般疑问句,作否定回答时用情态动词needn’t,故正确答案为C。

15选C。考查情态动词have to的用法。may意为“可能、或许”,can意为“能、会”,have to意为“必须、不得不”,表客观要求,而must 表主观愿望。根据题意“为了健康,你必须戒烟”可选C。

16选B17选D

18选B。考查情态动词may表示推测。结合前句“I’m not sure. Ask our monitor, please.”可知题意为“他可能知道(我们将在哪里开班会)”,故选B。may表示可能性的推测,常用在肯定句中。

19选C

20选C

6

一、 考点、热点回顾 情态动词

【词汇辨析】

1. sometimes/ some times/sometime/ some time:

sometimes: “有时”=at times. He is sometimes late for school.

some times: “几次” I have been to Nanjing some times.

sometime: “某一时刻” I bought it sometime last spring.

We’ll meet again sometime next week.

some time: “一段时间” We have to stay here for some time.

2. many/ much/ a few/ a little/ few/ little

(1)many修饰可数名词,much修饰不可数名词;都表示许多。例如:

许多书 许多牛奶 (2)a few和a little都表示"有一点儿",侧重于肯定,相当于"some",但a few修饰可数名词,

a little修饰不可数名词,例如:

He has a few friends in London.

---Would you like some coffee?

---Yes, just a little.

(3)few和little表示"几乎没有",侧重否定。few后接可数名词,little后接不可数名词。例如:

He is a strange man. He has few words.

Hurry up, there is little time left.

【固定搭配】加-ing

be busy doing sth. 忙于做…… eg: Mother is busy cooking.

look forward to + doing sth. 期待做…… eg: Tom looks forward to seeing his father again.

Thank you for (doing) sth. 为了…感谢你 eg: Thank you for your help.

愉快地做某事 eg: I had great fun playing in the water.

=have a good time doing sth eg: I had a good time playing in the water.

做某事有困难

eg: I have difficulty finishing my homework in 2 hours.

【情态动词】 又叫情态助动词。它们具有以下特点:

⑴ 它们必须与其他动词连用,即:情态动词+动词原形

表示说话人对所述动作的看法,如需要、可能、意愿或怀疑等。

⑵ 绝大多数情态动词没有人称和数的变化,即第三人称单数不加-s

(以be和have 开头的情态动词短语除外)。

⑶ 在意义上,情态动词具有“多义性”。

例:can既可表示能力,又可表示可能、允许等意义。

【情态动词的基本用法】

1. can的基本用法:

⑴ 表示体力或智力上的能力,即“能够,会”,可与be able to转换。

例:He can speak English. = He is able to speak English.

—Can you play basketball?

— No, I can’t.

如果表示将来具备的能力,要用will be able to。

例:If I have a good sleep, I will be able to do the problem.

⑵ 表示许可,主要用于口语,书面语一般用may。

例:—Can we go home now, please?

— No, you can’t.

You can only smoke in this room.

You can’t keep the library books for more than a month.

⑶ 表示“可能”,与may同义,但一般用在疑问句中。

例:What can he possibly want?

在否定句中,否定形式can’t表示推测“不大可能”。

例:Anybody can make mistakes.

The news can’t be true.

与第一、二人称连用时,还可以就可能的解决问题的方式或可能的行为提出建议。在这里,也可用could使语气婉转。

例:Can / Could we meet again next week? 下周我们可以再见面吗?

—What shall we do? 我们怎么办呢?

— We can / could try asking Lucy for help. ——我们可以请露茜帮忙试试看。

You can / could help me with the cooking. 你可以帮我做饭。

2. may的基本用法:

⑴ 表示“许可”,用can比较口语化。

例:You may / can come if you wish. 如果你想来,你就来。

You may not pick flowers in this park. 本公园内不许摘花。

表示按规定不许可,如果用mustn’t则表示说话人不许可。)

我可以在这里抽烟吗?

mustn’t表示明确的禁止。)

⑵ ”。

例:It may rain tomorrow. 明天可能会下雨。

注意:如果“可能”

例:那会是真的吗?

他究竟是谁呢?

⑶ 【注意】:

——No3. must的基本用法:

⑴ 表示必须,强调说话人的主观意志。

例:I must go now, or I’ll be late.

ten o’clock.

【注意】:表示“必须“

时,must的否定式为,而不是mustn’t。

也就是:—Must

——例:——

⑵ 表示推测,一般只用于肯定陈述句,表示非常肯定。

例:She didn’t look at me. She must be angry. 她不朝我看,一定是生气了。

He is good at English. He must know the word. 他英语好,准知道这个词。

You must be Mr. Jones. 想必您就是琼斯先生吧。

4. have to的基本用法:

have to可视为情态动词,但它与其他情态动词在用法上稍有不同。其他情态动词没有人称和数的变化,而

have to却有人称和数的变化,要视主语的不同而变化。

例:I / You / We / They have to….

He / She / It to….

You don’t to….

“必须,不得不”。

强调主观需要

have to强调客观需要。

例:Sorry, I have to leave now. 对不起,现在我得走了。

Igo to a meeting. 我得去参加一个会议。

Will hework deep into the night? 他将不得不工作到深夜吗?

5. need的基本用法:

need的基本词义是“需要”,它既可作情态动词,又可作实义动词。

⑴ need用作情态动词时,只用于否定句和疑问句。它只有一种形式,后接动词原形。

例:I don’t believe you need worry. 我相信你没有必要焦急。

—Need we go so soon? 我们需要这么早就去吗?

— Yes, we . / No, we 是的,必须。/不,不必。

So I needn’t tell him, need I? 所以我不需要告诉他,对吧?

请比较以下两句话的不同意思:

你没有必要买那件外衣。(你还没买)

You 你没有必要买这件外衣的。(而你却买了)

My watch needs . 我的手表需要修理了。

We don’t need to work today. (= We needn’t work today.)

Does he need to go right now? (= Need he go right now?)

6. had better的基本用法:

to的动词不定式。

You’d better not

do that again. 你最好别再做那件事。

What had we better do now? 我们现在怎么做才好呢?

Hadn’t7. could, should, would, might表示推测:

①. must多用于肯定句中表示把握性极大的推测,意思为“一定、肯定”。

如: You have worked hard all day. You must be tired. 你已辛苦工作一整天了,一定累了。

The book must be his. His name is on the cover. 这本书一定是他的,封面上写着他的名字。

【注意】 must不表推测时,在肯定句中意思为“

必须(强调内在的职责)”,在否定句中意思为“不许、禁止”,以它开头的疑问句否定回答常用

needn’t或don’t (doesn’t) have to。

如:We must obey the traffic rules. 我们必须遵守交通规则。

Cars mustn’t be parked here. 此处严禁停车。

—Must we hand in the papers this week? 我们必须本星期交论文吗?

—No, you needn’t. 不,你们不必(本星期交)。

②或感叹句中表示推测、怀疑,两者在时间上没有差别。用can时不相信的程度更强一些,

如Tom. He’s gone to England. 这个人不可能是Tom,他已经去英国了。

Can it be true that he was fooled by a five-year-old boy? 他被一个五岁的孩子愚弄了,这能是真的吗?

Could this be an excuse? 这会不会是个借口?

How can you be so careless! 你怎么这样粗心!

③意思为“也许、可能”, might比may的把握性更小一些。

“不可能”与“可能不”在把握性大小上的差异。)

如may umber.王先生也许知道李教授的电话号码。

This 这可能就是汤姆一直在找的钥匙。

She 今天她可能不在那儿。 二、 典型例题 【中考链接】

( )1.—Who is the man over there? Is it Mr. Li?

— No, it ______ be him. Mr. Li is much taller.

A. mustn’t B. may no C. can’t D. needn’t

( )2.—Must I go with them tomorrow?

— No,

A. mustn't B. shouldn't C. needn't D. can't

( )3.—______ I take some photos in the hall?

— No, you ______.

A. Can, needn’t B. Must, mustn’t C. Could, won’t D. May, mustn’t

( )4.—Dad, must I finish my homework today?

—No, you ________. You may do it tomorrow.

A. needn’t B. mustn’t C. don’t D. won’t

( )5.—The lake is said to be dry. Is that true?

—It _______.Look, some kids are swimming in it.

A. must be true B. can’t be true C. may not be true

( )6.—What is your mother going to do this Saturday?

—I’m not sure. She _____ go to see my grandmother.

A. can B. must C. may

( )7.—Susan has bought a large house with a swimming pool.

—It ______ be very expensive. I never even dream about it.

A. must B. might C. can’t D. shouldn’t

( )8.—Listen! Is Professor Johnson giving a report in the hall?

—No, it be him. He has gone to Japan.

A. needn’t B. may not C. mustn’t D. can’t

( )9.—Let’s go to the West Hill Park by taxi.

—Oh, it is not far away from here. We _______take a taxi.

A. couldn’t B. mustn’t C. needn’t D. can’t

( )10.—Can you play the piano?

—Yes, I _______. I often practice it on weekends.

A. needn’t B. need C. can’t D. can

三、课后练习

一、用can, may, must, need, have to, had better的适当形式填空:

1. You ________________ return the library book on time.

2. I ______________ (not) find the way to the hospital. _______________ you show me the way?

3. —________________ I finish the work right now?

— No, you ________________ (not). You ____________ do it later.

4. He said he ________________ (not) come tonight.

5. Her mother was ill. She ________________ stay at home and look after her.

6. It’s time for class. You ________________ stop playing football or you __________be late for class.

7. We ________________ start right now, or they would get there first.

8. The cloud is lifting, so it ________________ (not) be a rainy day tomorrow.

二、选择填空

( )1.—Do we have to finish our homework this afternoon?

—Yes, you ________.

A. must B. can C. may D. need

( )2. —Must I be in hospital for a week, Doctor? 

—No, you 

A. mustn’t B. needn’t C. must

( )3. The desk is not dirty. You _______clean it.

A. mustn’t B. shouldn’t C. needn’t C. can’t

( )4. —May I watch TV for a while?

—No, you _______. You have to finish your homework first.

A. shouldn’t B. needn’t C. mustn’t D. won’t

( )5.—Is Jessica giving us a speech this evening?

—No, it ________be her. She________ to Japan.

A. mustn’t; has gone B. mustn’t ;has been C. can’t ;has gone D. can’t ;has been

( )6. It’s the library! So you________ know shouting is not allowed here.

A. can B. must C. need D. may

( )7. Boys and girls, don’t forget your report . It ______ today.

A. can’t finish B. can’t be finished C. should finish D. should be finished

( )8.—Mr Smith must have been to your home this morning.

—No, he ______ ,because he didn’t know my address.

A. couldn’t B. can’t C. mustn’t D. may not

( )9. —Must I mop up the window now?

—No, you________.

A. needn’t B. can’t C. shouldn’t D. mustn’t

( )10. —Is Lucy knocking at the door?

—No. It ________ be Lucy. She is in Japan now.

A. needn’t B. must C. can’t

( )11. —Another cup of coffee?

—No, thanks. I _____ be off. Mary is waiting for me.

A. can B. may C. must D. might

( )12. —I’m a little tired. Let’s go to the zoo by taxi.

—We take a taxi. It’s not far from here.

A. can’t B. mustn’t C. couldn’t D. needn’t

( )13. If the traffic light is red, you ________ cross the road. It’s very dangerous.

A. don’t B. mustn’t C. needn’t D. wouldn’t

( )14. —Must I finish watering the flowers now?

—No, you________.

A. must B. won’t C. needn’t D. can’t

( )15. —I can’t give up smoking, doctor.

—For your health, I’m afraid you ________.

A. may B. can C. have to D. must

( )16. It is usually warm in my hometown in March, but it _______ be rather cold sometimes.

A. must B. can C. should D. would

( )17. —Our class won the English speaking contest.

—Congratulations! You _______ be very proud of it.

A. can B. need C. would D. must

( )18. —Excuse me, where are we going to have our class meeting?

—I’m not sure. Ask our monitor, please. He know.

A. can B. may C. need D. shall

( )19. —____________I borrow these magazines?

—Sorry, only the magazines over there can be borrowed.

A. Must B. Would C. May D. Need

( )20. If the traffic light is red, you ________ cross the road. It’s dangerous.

A. don’t B. needn’t C. mustn’t D. wouldn’t

情态动词

典型例题

例1答案 C 分析:表示否定的猜测用can’t 。must表示推测时,意为“一定”,只能用于肯定句,而must的否定must not(mustn't)表示“不应该”、“不许可”、“不准”、“禁止”等。

例2答案 C 分析:在回答带有must的问句时,否定式常用need not (= needn't),表示“不必”,而不用must not,因为must not表示“不可以”。

例3答案 D 分析:本题第一句是请求对方的允许,需要用May,其否定式为mustn’t。

例4答案A。对于以情态动词must提问的疑问句,否定回答要用“No, 主语+needn’t”,故由问句中的must和答句中的No可选A。

例5答案B

例6答案 C

例7答案A 考查情态动词must表示肯定的推测。结合关键信息“I never even dream about it.”可知题意为“它肯定是非常贵的”,故排除B、C、D三项。

例8选D。本题考查can’t表示否定的推测。四个选项都是情态动词的否定形式,分别意为“不能;不可能”、“千万不能”、“应该”、“可以;可能”。结合关键信息“He has gone to Japan.”可知“他不可能是约翰教授”应选D。 例9选C

例10选D。以can 引导的一般疑问句再作肯定回答时还是用can。

课后练习

一、1. must 2. can’t, Could 3. Must, needn’t, may 4. couldn’t 5. had to 6. must, may 7. had better 8. can’t

二、 1A2B3C4选C。对于情态动词may的一般疑问句的肯定回答为:Yes,you may / can . 否定回答为:No, you mustn’t.5C6B7D8A9A

10选C。考查情态动词can’t表示推测的用法。can’t表示否定的推测;must表示肯定的推测。由题意“不可能是露西,她现在在日本”可知应选C。

11选C。考查情态动词must的用法。结合关键信息“Mary is waiting for me.”可知题意为“我必须离开了”,故排除A、B、D三项,选C。

12选D。四个选项都是情态动词的否定式,结合关键信息“It’s not far from here.”可知“我们不必乘出租车”,故排除A、B、C三项,选D。

13选B。考查情态动词mustn’t的用法。mustn’t意为“一定不能”,由“很危险”可知用mustn’t,故选B。

14选C。考查对must开头的一般疑问句的回答。以must开头的一般疑问句,作否定回答时用情态动词needn’t,故正确答案为C。

15选C。考查情态动词have to的用法。may意为“可能、或许”,can意为“能、会”,have to意为“必须、不得不”,表客观要求,而must 表主观愿望。根据题意“为了健康,你必须戒烟”可选C。

16选B17选D

18选B。考查情态动词may表示推测。结合前句“I’m not sure. Ask our monitor, please.”可知题意为“他可能知道(我们将在哪里开班会)”,故选B。may表示可能性的推测,常用在肯定句中。

19选C

20选C

6


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