Modal Modal verbsverbsModal Modal verbsverbs

省扬中专 朱晴

A puzzle

4.You might see it in the Yangtse River in spring .

5.It can be eaten by people and it’s delicious, but it must be dangerous to people because it’s poisonous.

3.It can have food in the water .

2.It can swim when it is very young .

1.It must be a king of animal .

baloon fish

情态动词的具体用法1. 有关 can 和 be able to 的题目

1).After practicing a lot, he _______ speak English at the meeting.

2).Tom _____ride a bicycle when he was very young.( can , be able to )

was able to

could

小结： can, be able to 都可以用来表示能 力，但也有区别：(1)can 只有一般现在时和过去时，且有被动语

态。但 be able to 另外还可用于将来时、完成时等，

它没有被动语态。

(2)be able to 用于过去时，表示经过一番努力、克服困难做成某事，常用于肯定句和疑问句。

练习：用 can 和 be able to 填空a.I will _______ speak Japanese in another fe

w months.

b. I _____ swim across the river when I was young.

c. When the boat sank( 下沉 ), he _______ swim to the bank.

be able to

could

was able to

2 ．有关 may ( might ) ,can ( could ) 的题目(1) 表示允许或请求 ----_____ I use your pen, Miss Smith? ---- Yes, you may . ---- No, you mustn’t.

Might I use your pen?

---- Could I use your phone? ----Of course, you ______ .

小结： ( might 比 may 更客气 , 表示请求 ) ； ( could 表示请求许可 ,can 表示给予许可 )

May

can

练习：用 can/ may/ could 填空a. Please don’t stop him. He _______ have something else to say.b. Mr. Wang ______ not be in the office now, because the light is off.c. —— _______ I use your dictionary? —— Of course , you _____.

may

can

canCould

3. 有关 need 、 must 和 have to 的题目• You ______ not bring money tomorrow,

I’ll pay for the bill .• ----Need I explain once again?• ----Yes, you _____ .• ----No, you needn’t.

• 此外， need 还可用于行为动词，如： need to do…(don’t need to do…)

• Today is Saturday. I don’t need __________ （早起） .

need

must

to get up early

----Must I send for a doctor at once? ---- _________ .A. No, you mustn’t B. No, you may notC. No, you needn’t D. No, you can’t

We ______ （必须） listen to the teacher carefully in class.

You ________ （不可以，禁止，） drive after drinking.

C

must

mustn’t

• 此外， must 表示推测，意思为“一定”（用于肯定句中）

That ______ （一定） be your bed .The ground is wet. It ________ last night . A. must rain B. was rained C. must have rained D. had rainedHe must be your brother , __________ ? A. mustn’t he B. must he C. isn’t he D. is h

eLook at Mary’s red eyes , she must have cried , ________just now . A. mustn’t she B. wasn’t she C. hasn’t she D. didn’t she

must

C

C

D

My mother is ill . I _____ stay at home to take care of her .

A. can B. had to C. could D. have to

小结：“ must” 和 “ have to” 意思很接近，但 must 表示说话人的主观看法； have to 则表示客观需要。

D

练习：用 need 、 must 和 have to 填空a. You ______ not worry, I’ll be fine.b. You ______ not smoke in hospitals. It is ba

d for the patients.c. We _______ keep our promise.d. It’s very cold now. you _______ wear mo

re clothes.e. Where is Mr. Brown? He ______be in the of

fice.f. There’s nobody here, they ____________

______ (go ) home .

needmust

must

have to

must

must have gone

4. 关于 shall 和 will 以及 should 和 would 的相关题目

①shall ： (1) 常用于第一人称疑问句中，表示征求对方的意见。

②will ： (1) 常用于第二人称疑问句中，请求对方做某事

• 练习：用 shall 和 will 填空• a. ________ you come with me to the city to vi

sit Uncle Bill?• b. Dad, mum asked me to clean the floor. ____

___ I do it now or later?

Will

Shall

③ should :(1) should 表示义务，“必须，应该”。e.g. As vocational school students, we should l

earn from Deng Jianjun.(2) 在 suggest, advise, insist 等引导的宾语从句

中，用 ( should ) + do(3) The plant is dead. I ___ it more water .A. will give B. would have given C. must give D. should have given④ would （ will 的过去式）表示意愿 ； 或表示

礼貌的请求。She would not tell me why she refused my req

uest .________________________________

D

他不肯告诉我为什么他拒绝我的请求。

试比较 would have done , could have done ,should have done 和 must have done 之间的区别。

He didn’t hear the phone. He _____ asleep .A. must be B. must have been C. should be D. should have been

小结：

B

二． Fill in the blanks will the correct modal verbs given in brackets.

1. June: Excuse me, ______(may/must) I use your computer for a while?Melissa: Yes, you ______(should/can). But it is not connected to the internet, so if you want to check your e-mail, you won’t be able to. June: Then I’ll _______(can/have to) find another one, but thank you anyway.

may

can

have to

• 2. Boss: All the documents______ (must/can) • be prepared before the meeting starts.• Secretary: I know that. Kelly has been working• on the documents since last

Monday. • She ______(may/ must) have got• everything ready, but I’m not sure.

• Boss: Where’s Kelly then?• Secretary: She _______(must/have to) be in• the sales manager’s office now. I • saw her go in there a minute ago.

must

may

must

Step 4 、 Multiple choices:• 1. ______ we have the meeting now?• A. Shall B. Will C. Should D. Would• 2. ----Need I start right now? ---Yes, you ____.• A. need B. must C. may D. can• 3. A computer ______ think for itself, it must be told what

to do .• A. can’t B. couldn’t C. may not D. might not• 4. Michael ______ be a policeman , for he is much too

short.• A. needn’t B. can’t C. should D. may• 5. ——Could I borrow your dictionary? —— Yes, you _____.• A. could B. can C. may D. might

• 6. You ______ take your umbrella. I an sure it won’t rain.• A. shouldn’t B. can’t C. don’t have to D. mustn’t• 7. Why is it so dark? There _____ be a heavy rain coming.• A. shall B. may C. should D. will• 8. Tom, you ______ play with the knife, you ______ hurt yours

elf.• A. won’t could B. mustn’t may• C. shouldn’t must D. can’t should• 9. —— You __________ here at 10:00, but it’s 10:30 now .• —— I’m so sorry . Teacher.• A. had to be B. must have been C. should have come D. ough

t to come• 10. （思考题）：• I got up early this morning, but I ____ so because I had nothin

g to do.• A. must have done B. can’t have done• C. needn’t have done D. should have done

Step 5 、 Translation1. 你不需要现在还书，你可以看到下周为止。（ need 的两种译法）

2. 他今天早晨非常疲倦，昨晚他准是熬夜了 , 不是吗？（ must ）

3. 老师建议我们要更加努力学习英语。（ should ）

4. 玛丽本应该听从父母的意见，否则也不会犯这么严重的错误。（ should 或 ought to ）

You need not return your book now. You can keep it till next week .

He is very tired this morning . He must have stayed up , didn’t ?

The teacher suggested that we should work harder at English.

Mary should have followed her parents’ advice , otherwise she wouldn’t make such a serious mistake .

Thank Thank you!you!

• We use modal verbs to talk about • ability ( 能力 ): can • obligation ( 义务 ) : should ,have to ,must …….• certainty possibility ( 可能性 ): might ,may ,could,

can ……….• permission ( 允许，许可 ) ： can ,could ,may ,mig

ht • We also use modal verbs to • Δ make requests ( 提出请求 ): will ,can ,could ,wo

uld • Δ make suggestion ( 提出建议 ): shall• Δ make offers ( 提出想法 ): will ,shall• Δ give advice ( 提出忠告 ): should………..