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专题 04 情态动词 知识梳理
Modal Verb
·模块一 can/could/be able to用法分述。
·模块二 may/might用法分述。
·模块三 must/have to用法分述。
·模块四 should/ought to用法分述。
·模块五 need用法分述。
·模块六 will/would用法分述。
·模块七 would rather/had better用法分述。
can/could/be able to用法分述
1. can/could的基本形式和用法:
could是can的过去式,或作为委婉语
a. 用于请求或允许,意为“能……”
-- Could/Can I have the television on?
-- Yes, you can. / No, you can’t.
b. 在疑问句和否定句中表示推测,意为“可能……吗?”、“不可能”
他可能是坏人吗?他不可能是坏人。
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Can/Could he be a bad guy? No, he can’t/couldn’t be a bad guy.
c. 用于陈述句,表示事情发生的“理论上的可能性”,意为“会”
事故总会发生。
Accidents can happen.
d. 表示能力,意为“能够”
He couldn’t speak English when he was young.
could作为can的过去时/委婉语,请打勾
过去时 委婉语
表请求或允许 √
表推测 √
表可能性 √
表能力 √
2. can/could与be able to的差别:
a. 表示能力时, can表示现在、could表示过去;be able to可以用于任何时态,也可以前
加情态动词或助动词,如:will be able to, have been able to, should be able to
b. 用于过去时中,could表示“有能力做”而“并不一定做成”;若是“实际得以做成某
事”,只能用was/were able to=manage to do sth.
司机得以逃生,其他的乘客没有逃出来。
The driver was able to escape, but the passengers failed to do so.
Ms. Wang could sing well when she was young.
I was able to pass the examination. 我通过了考试.(不仅有能力,而且实际上做到了.相当于I
succeeded in passing the examination.)
I could pass the examination. 我当时有能力通过考试.(有能力,但实际上不一定做得到)
can/could与be able to差别总结
can/could be able to
表请求或允许 √ ×
表推测 √ ×
表可能性 √ ×
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表能力 √ √
时态 现在/过去 任何时态
用于过去时中含义 有能力但不一定做成 实际得以做成
3. can/could的惯用语:
a. cannot help doing sth.情不自禁做某事
我情不自禁地笑了。
I cannot help laughing.
b. cannot help/choose but do sth.不得不,只能做某事
我不得不告诉她真相。
I cannot help/choose but tell her the truth.
c. cannot … too + adj./adv. 无论怎样都不为过,越……越好
你越小心越好。
You cannot be too careful.
d. cannot … without 没有……就不能
One cannot succeed without perseverance.
没有坚持就不能成功。
e. could not + 比较级 = 最高级
-- Go for a picnic this weekend, OK?
-- I couldn’t agree more.
我非常同意。
★真题试炼★
1.(2023·吉林长春·统考中考真题)This _______ be Alice’s guitar. Hers is still in my house.
A.should B.can’t C.must D.needn’t
2.(2023·辽宁丹东·统考中考真题)—Can you swim in this river?
—________. It’s too dangerous.
A.Yes, I can B.No, I can’t C.Yes, you may D.No, you needn’t
3.(2023·辽宁·统考中考真题)—Is this red jacket Tony’s?
—No, it ________ be his. He doesn’t like red.
A.can’t B.mustn’t C.needn’t D.wouldn’t
4.(2023·辽宁抚顺·统考中考真题)The lovely boy ________ ride the bike at the age of six.
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A.must B.could C.need D.should
5.(2022·辽宁大连·统考中考真题)—Wilson, ________ you help me carry the box upstairs?
—Sure, no problem.
A.could B.need C.should D.might
1.B
【详解】句意:这不可能是爱丽丝的吉他。她的还在我家里。考查情态动词。should应该;can’t不可能;
must必须,一定;needn’t不必。根据“Hers is still in my house.”可知此处表示语气强烈的否定推测,用
can’t。故选B。
2.B
【详解】句意:——你能在这条河里游泳吗?——不,我不能。太危险了。考查一般疑问句的回答。Can
you...的肯定回答为Yes, I can,否定回答为No, I can’t。结合“It’s too dangerous.”可知应作否定回答,故选
B。
3.A
【详解】句意:——这件红夹克是托尼的吗?——不,不可能是他的。他不喜欢红色。考查情态动词。
can’t不可能;mustn’t禁止;needn’t不需要;wouldn’t将不。根据“He doesn’t like red.”可知这件红夹克不
可能是托尼的,表示有把握的否定推测应用can’t,故选A。
4.B
【详解】句意:那个可爱的男孩在6岁时就会骑自行车了。考查动词辨析。must必须;could可以;need
需要;should应该。根据“at the age of six”可知该句应用情态动词could表示“过去的能力”。故选B。
5.A
【详解】句意:——威尔逊,你能帮我把箱子搬上楼吗?——好的,没问题。考查动词辨析。could能;
need需要;should应该;might可以。根据“Sure, no problem.”可知,此处是寻求对方帮助,应使用委婉语
气,用could。故选A。
may/might用法分述
1. may/might的基本形式和用法:
might是may的过去式,亦可作委婉语
a. 表示请求或允许,意为“可以……”
-- May I smoke here?
-- Yes, you may/can.
-- No, you can’t/mustn’t.
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b. 表示对事实的不太确定的推测,意为“可能”
The greatest fool may ask more than the wisest man can answer.
愚人之问也可能让智者无言以对。
c. may放在句首,表示祝愿
场景连线:
May God bless you! on grandpa’s birthday
May you succeed in your career! on the graduation ceremony
May we never forget each other! on the wedding ceremony
May you live long and prosper! before the mid-term exam
May you love forever and have a lovely baby soon! on the farewell dinner
May good fortune find you this year! during the Spring Festival
2. may/might的惯用语:
a. may well do 理所当然,有足够的理由=have good reason to
我有足够理由不去上学。
I may well not go to school.
b. may/might as well do 最好
你最好呆在家里。
You may/might as well stay at home.
c. may/might as well do A as do B 与其做B不如做A
One may as well not know a thing at all as know it but imperfectly.
与其一知半解,不如全然不知。
★真题试炼★
6.(2022·四川·统考中考真题)—________ I help you, sir?
—Yes, I’d like to try on those black shoes.
A.Will B.Should C.Must D.May
7.(2022·统考中考真题)—_______ I use your glue? I’m making a kite.
—No problem. Here you are.
A.Should B.Need C.Must D.May
8.(2022·辽宁锦州·统考中考真题)—Will plants grow on other planets?
—That ________ be true. It’s really difficult to predict the future.
A.mustn’t B.should C.needn’t D.may
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9.(2023·山东菏泽·统考中考真题)—Where are you going this summer vacation?
—I ________ go to Zibo, but I’m not sure.
A.must B.needn’t C.might
10.(2022·湖南怀化·统考中考真题)—Whose English book is this?
—It _______ be Lily’s, but I’m not sure.
A.might B.can’t C.must
6.D
【详解】句意:——先生,我可以帮助你吗?——是的,我想试穿那双黑色的鞋子。考查情态动词辨析。
Will将;Should应该;Must必须;May可能;(征求同意或表示允许)可以。根据“I help you,”可知,此
处表示委婉语气,询问对方是否需要帮助,应填may,故选D。
7.D
【详解】句意:——我可以用你的胶水吗?我在做风筝。——没问题。给你。考查情态动词。Should应该;
Need需要;Must必须;May可以。此处表征求他人的同意,应用May引导一般疑问句。故选D。
8.D
【详解】句意:——植物会在其他星球上生产吗?——那可能是真的。未来真的很难预测。考查情态动词。
mustn’t不可以,表禁止;should应该,应当;needn’t不需要;may可能,表推测。根据“It’s really
difficult to predict the future”可知,未来很难预测,因此推测可能是真的。故选D。
9.C
【详解】句意:——这个暑假你要去哪里?——我可能去淄博,但我不确定。考查情态动词。must必须;
needn’t不需要;might可能。根据“but I’m not sure.”可知,此处指可能去淄博,表一种可能的推测。故选
C。
10.A
【详解】句意:——这是谁的英语书?——可能是莉莉的,但我不确定。考查情态动词。might可能;
can’t不可能;must一定;结合“but I’m not sure.”可知,此处是一种不确定的推测,应用might,故选A。
模块三 must/have to用法分述
1. must的基本用法:
a. 用于询问、命令或建议,意为“必须”,mustn’t意为“禁止”
-- Must/Need I leave the office after five o’clock?
-- Yes, you must.
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-- No, you needn’t.
b. 用在肯定句中表示较有把握的推测,意为“一定”
他现在一定在公司。
He must be in the office now.
♥Attention♥
must表对现在的状态或现在正发生的事情的推测时,must 后面通常接be (doing)
比较:You must be sleeping now. VS. You must sleep now.
表猜测用法小结:
对 现 在 ( 正 在 进 对过去
行)
肯定句 must/may/might/could +be/be doing +have done
否定句 can’t/couldn’t/may not/might not
疑问句 can/could
c. must表示自然规律或必然结果,意为“必然”
All men must die.
人必有一死。
2. must与have to的差别:
must意为“必须”时,与have to的意思相同,但:
a. have to表示客观条件有所要求,must表示说话者主观上认为必要
他说他们必须努力工作。(主观上要做这事)
He said that they must work hard.
居民们不得不忍受广场舞的噪音。
The residents have to stand the noise of the public square dancing.
b. 只有在间接引语中,must才能表示过去
判断下列句子对错:
1) He had to look after his sister yesterday. (√ )
2) He must look after his sister yesterday. ( ×)
3) He said he must look after his sister when their parents were away. (√)
4) He said he had to look after his sister when their parents were away. (√ )
c. 在否定结构中,don't have to表示“不必要”,mustn't表示“不允许”
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你不一定要把此事告诉他。
You don’t have to tell him this.
你一定不要把这件事告诉他。
You mustn’t tell him this.
表“必须”比较:
must have to
主客观 主观意志 客观条件
时态、人称、 无 有have/has/had to
数的变化
用于过去时 不可直接用,可以用于间 可直接用
接引语
否定形式含义 mustn’t 不允许 don’t have to不必要
3. have to补充说明:在口语中have got to亦可表示义务和需要,与have to基本同义
他现在必须走了。
(用have got to)He has got to go.
疑问句:Has he got to go?
否定句:He hasn’t got to go.
(用have to)He has to go.
疑问句:Does he have to go?
否定句:He doesn’t have to go.
★真题试炼★
11.(2023·江苏无锡·统考中考真题)Oh, come on! ________ you doubt everything I say? I’m not a three-year-
old!
A.Can’t B.Can C.Mustn’t D.Must
12.(2023·湖北孝感·统考中考真题)— How beautiful the paper cutting is! Who made it?
— It ________ be Linda. She’s the only one that can make it in our class.
A.must B.would C.can D.could
13.(2023·山东滨州·统考中考真题)—The paper cutting is pretty lively. Who made it?
—It ________ be Mary. None of us except her is able to do it.
A.can B.must C.need D.might
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14.(2022·江苏淮安·统考中考真题)—Miss Li. I don’t want to say sorry to Daniel.
—I’m afraid you ________. After all, you broke his glasses.
A.may B.have to C.mustn’t D.needn’t
15.(2022·湖北荆州·统考中考真题)—Mike, I can’t stop playing computer games.
—For your eyes, my dear friend, I’m afraid you ________ .
A.could B.may C.would D.have to
11.D
【详解】句意:哦,别这样!你非得要怀疑我所说的一切吗?我不是三岁小孩!考查情态动词的用法。
Can’t不能;Can能;Mustn’t禁止;Must偏要,非得。根据“...you doubt everything I say? I’m not a three-
year-old!”可知,此处是抱怨的语气,“你非得要怀疑我所说的一切吗”,用must表示“偏要、非得”。故
选D。
12.A
【详解】句意:——多么漂亮的剪纸啊!谁做的?——一定是Linda。她是我们班唯一能做剪纸的人。考
查情态动词辨析。must一定;would将;can能够;could可以。根据“She’s the only one that can make it in
our class”可知,她是唯一一个会做剪纸的人,所以猜测一定是Linda,表示十分有把握的肯定推测用
must,故选A。
13.B
【详解】句意:——剪纸很生动。是谁做的?——一定是Mary。除了她,我们谁也做不到。考查情态动词。
can能;must一定;need需要;might可能。根据“None of us except her is able to do it”可知除了Mary,没
有人能做,所以一定是Mary做的。故选B。
14.B
【详解】句意:——李小姐。我不想向丹尼尔道歉。——恐怕你必须这么做。毕竟,你打破碎了他的眼镜。
考查情态动词。may可能;have to必须;mustn’t禁止;needn’t不需要。根据“After all, you broke his
glasses.”可知对方必须要向丹尼尔道歉,故选B。
15.D
【详解】句意:——Mike,我不能停止玩电脑游戏。——为了你的眼睛,我亲爱的朋友,我恐怕你不得不
停止玩电脑游戏。考查情态动词。could能够;may可能;would会;have to不得不。根据“For your eyes”
可知为了你的眼睛,你不得不停下来。故选D。
should/ought to用法分述
1. should的基本用法:
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a. should 表示劝告、建议、命令,意为“应当、要”,其同义词是 ought to/be supposed
to,在疑问句中,通常用should代替ought to
You should do exercises.
= You ought to do exercises.
= You are supposed to do exercises.
b. 用于表达合理的推断,意为“应该”
三点到了,足球赛应该快要开始了。
It’s three o’clock. The football game should begin soon.
c. 用于虚拟语气,意为“应当”
I suggested/advised/urged/ordered (that) you finish your homework first. (should) do
If I were you, I should accept their suggestion.
Now he has to pay a fine. He shouldn’t have tried to steal a ride.
♥Attention♥
should have done 本应该做某事(而实际上没有)
shouldn’t have done 本不应该做某事 (而实际上做了)
d. 表示义务,意为“应该做”,且表示一种道义上的责任
I should help him because he is in trouble.
e. 表示惊讶、忧虑、惋惜等情绪,意为“竟会、竟然”
You can’t imagine that a well-behaved gentleman should be so rude to his girlfriend.
2. ought to的用法:
肯定句:He ought to finish the task.
一般疑问句:Ought he to finish the task?
否定句:He ought not to finish the task.
★真题试炼★
16.(2023·湖北武汉·统考中考真题)—Excuse me, but we ________ wait in line to get on the subway.
—I’m sorry.
A.might B.would C.could D.should
17.(2023·江苏连云港·统考中考真题)Earthquakes can be very dangerous. We ________ learn to protect
ourselves.
A.might B.should C.could D.would
18.(2023·湖北恩施·统考一模)If you want to be a greener man, you ________ shut off the light when leaving
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a room.
A.dare B.ought to C.would
19.(2023·福建宁德·统考二模)—Whose rope is this?
—It ________ be Tom’s. He used this blue rope in the P. E. class just now.
A.had better B.ought to C.used to
20.(2022·江苏常州·统考中考真题)To achieve our dream, we ________ rest on what we have done.
A.may not B.should not C.need not D.could not
16.D
【详解】句意:——对不起,我们应该排队上地铁。——我很抱歉。考查情态动词辨析。might可以;
would将;could可以;should应该。根据“but we …wait in line to get on the subway”可知,应该排队上地铁,
故选D。
17.B
【详解】句意:地震可能非常危险。我们应该学会保护自己。考查情态动词。might可能;should应该;
could能;would将。根据“We...learn to protect ourselves.”可知此处是表示建议,我们应该学会保护自己,
故选B。
18.B
【详解】句意:如果你想成为一个环保的人,你应该在离开房间的时候关灯。考查情态动词。dare敢;
ought to应该;would将要。根据“If you want to be a greener man, you...shut off the light when leaving a
room.”可知,离开房间的时候应该要把灯关掉,故选B。
19.B
【详解】句意:——这是谁的绳子?——应该是汤姆的。他刚才在体育课上用了这根蓝色的绳子。考查情
态动词和动词短语辨析。had better最好;ought to应该;used to过去常常。根据“He used this blue rope in
the P. E. class just now.”可知,此处猜测应该是Tom的绳子,故选B。
20.B
【详解】句意:为了实现我们的梦想,我们不应该依靠我们已经做了的。考查动词辨析。may not也许不;
should not不应该;need not不需要;could not不能。根据“To achieve our dream, we...rest on what we have
done.”可知,此处表示建议,不应该依靠我们已经做了的,故选B。
need用法分述
1. need的基本用法:请在下表内填空(dare跟need用法相同)
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She, need/dare, go there alone 实义动词 情态动词
现在 She needs/dares to go there
alone.
过去 She needed/dared to go there
alone.
否定 She doesn’t need/dare to go She needn’t/daren’t go
there alone. there alone.
疑问 Does she need/dare to go there Need/Dare she go there
alone? alone?
2. sth. need doing是主动形式表示被动= need to be done(见被动语态详解)
花园里的花需要浇水了。
The flowers in the garden need watering now.
★真题试炼★
21.(2023·江苏镇江·统考中考真题)The new app about fashion is really free and you ________ pay money
for it.
A.may B.must C.shouldn’t D.needn’t
22.(2023·湖北荆州·统考中考真题)—You _______ take the subway to the airport, for I can drive you there
directly.
—That’s very kind of you.
A.can’t B.needn’t C.mustn’t D.shouldn’t
23.(2022·湖北黄石·统考中考真题)—Mom, must I tidy my room right now?
—No, you ________. You can do it after breakfast.
A.needn’t B.mustn’t C.can’t D.shouldn’t
24.(2022·四川乐山·统考中考真题)— Must we wear the school clothes tomorrow, Mr. Wang?
— No, you ________. Only on Mondays. Tomorrow is Tuesday.
A.mustn’t B.needn’t C.can’t
25.(2023·内蒙古兴安盟·统考一模)—Must I finish the work today?
—No, you ________. But you ________ finish it before next Monday.
A.mustn’t; must B.needn’t; need C.mustn’t; could D.needn’t; must
21.D
【详解】句意:这款关于时尚的新应用程序真的是免费的,你不需要付费。考查情态动词。may可以;
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must必须;shouldn’t不应该;needn’t不需要。根据“The new app about fashion is really free”可知,这款app
是免费的,不需要付费。故选D。
22.B
【详解】句意:——你不必坐地铁去机场,因为我可以直接开车送你去。——你真是太好了。考查情态动
词。can’t不能;needn’t不必;mustn’t禁止;shouldn’t不应该。根据“take the subway to the airport, for I can
drive you there directly.”可知开车送他去机场,所以不必坐地铁。故选B。
23.A
【详解】句意:——妈妈,我现在必须整理房间吗? ——不,你不需要。你可以在早饭后做。考查情态
动词。needn’t不需要;mustn’t禁止;can’t不能;shouldn’t不应该。根据英语语法,对于must开头一般疑
问句,若要作否定回答,可用needn’t,不用mustn’t。故选A。
24.B
【详解】句意:——王老师,我们明天必须穿校服吗?——不,你不必。只有星期一需要。明天是星期二。
考查情态动词。mustn’t禁止;needn’t不必;can’t不可能。must引导的一般疑问句,否定回答用needn’t或
don’t have to,故选B。
25.D
【详解】句意:——我今天必须完成这项工作吗?——不,你不必。但你必须在下周一之前完成它。考查
情态动词。mustn’t禁止;must必须;neend’t不必;could能够。以Must I开头的一般疑问句,否定回答用
No, you needn’t. 再由“But you ... finish it before next Monday.”可推出下周一之前必须完成。故选D。
will/would用法分述
1. 表示恭谦的请求、建议等,常用于疑问句,would比will委婉客气
Would you mind my closing the window?
2. 表示意志、愿望和决心
I will never do that again.
3. 表示估计或猜想
It would be about ten when he left home.
4. 补充说明
a. would like to do = want to想要,为固定搭配
b. Would you like…? 表示肯定含义的请求劝说时,疑问句中一般用some,而不是any
c. 否定结构中用won’t,一般不用wouldn’t, won't you是一种委婉语气。
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Won't you sit down?
★真题试炼★
26.(2022·河北邯郸·统考三模)—Mum, I’ve signed for a big box by SF Express(顺丰快递). What’s in it?
—I’m not sure. It ________ be a present from your aunt.
A.might B.must C.should D.will
27.(2022·云南昆明·统考一模)—Can I park my car here?
—No, you ________. Look at the sign. It says “No parking”.
A.won’t B.wouldn’t C.needn’t D.mustn’t
28.(2022·辽宁葫芦岛·统考二模)—Mom, do you know where my keys are? I can’t find them.
—I’m not sure. They ________ be in your white bag.
A.shall B.may C.will D.must
29.(2022·湖北武汉·武汉外国语学校(武汉实验外国语学校)校考模拟预测)He pushed the door again
and again, but it open.
A.wouldn’t B.mustn’t C.shouldn’t D.needn’t
30.(2022·山东济南·统考一模)—Nick, ________ you like to join us to the museum?
—Why not? Let’s go.
A.can B.could C.would D.must
26.A
【详解】句意:——妈妈,我签收了一个顺丰快递的大盒子。里面是什么?——我不确定。可能是你阿姨
给你的礼物。考查情态动词的辨析。might可能,表推测;must一定,表推测;should应该;will将要。根
据“I’m not sure”可知妈妈并不确定,应填might“可能”。故选A。
27.D
【详解】句意:——我可以把车停在这里吗?——不,你不可以。看看那块标志牌。上面写着:禁止停车。
考查情态动词的否定式。won’t不会;wouldn’t不会;needn’t不需要;mustn’t不可以,表禁止。根据“No
parking”可知此处禁止停车,因此应回答“不可以”。故选D。
28.B
【详解】句意:——妈妈,你知道我的钥匙在哪里吗?我找不到他们。——我不知道。它们可能在你的白
色包里。 考查情态动词辨析。shall将;may可能;will愿意;must必须。根据“I’m not sure.”可知,妈妈
也不确定,因此是“可能”在白包里。故选B。
29.A
【详解】句意:他一次又一次地推门,但门打不开。考查情态动词。wouldn’t不会;mustn’t禁止;
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shouldn’t不应该;needn’t没必要。根据“He pushed the door again and again”可知,门被推了一次又一次,
因此表示不会被打开,故选A。
30.C
【详解】句意:——Nick,你愿意和我们一起去博物馆吗?——为什么不呢?我们去吧。考查情态动词辨
析。can可以;could可以;would将;must必须,根据“Why not? Let’s go”可知,空缺处应该是表征求意
见,would like to do sth“想要做某事”表征求意见,故选C。
would rather/had better用法分述
1. would rather do 宁愿 否定:would rather not do
在做两者比较用than
would rather do A than do B = would do A rather than do B
I would rather watch TV than go to see the film.
= I prefer watching TV to going to see the film. (prefer)
= I prefer to watch TV rather than go to see the film. (prefer)
如果than后面的动词与前面的一样,则可以省略:
I would rather work on a farm than in a factory.
如果than后面是句子,要加that引导的从句:
I would rather lose a dozen cherry trees than that you should tell me one lie.
2. had better do 最好 否定:had better not do
我们最好在冬天的时候多吃多睡来储存能量。
We had better eat more and sleep more to save energy in winter.
★真题试炼★
31.(2023·上海·一模)You had better ________ to see a doctor if you don’t feel well.
A.go B.to go C.going D.gone
32.(2022·广西梧州·统考一模)We had better _______ computer games for a long time.
A.play B.to play C.not play D.not to play
33.(2022·贵州铜仁·统考三模)— It seems that it is going to rain. You’d better _______ the windows open
when you go out.
— Thank you.
A.not to leave B.not leave C.leave D.to leave
34.(2022·甘肃陇南·校考模拟预测)You’d better ________ the TV. It’s time for supper.
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A.not to turn on B.to not turn on C.not turn on D.not turning on
35.(2022·广西·统考三模)You’d better ________ too much chocolate, or you’ll get fat.
A.eat B.to eat C.not to eat D.not eat
31.A
【详解】句意: 如果你感觉不好,最好去看医生。考查had better的用法。had better do sth“最好做某事”,
此空应填动词原形,故选A。
32.C
【详解】句意:我们最好不要长时间玩电脑游戏。考查had better的用法。had better (not) do sth“最好(不
要)做某事”,根据“We had better...computer games for a long time.”可知,最好不要长时间玩电脑游戏。
故选C。
33.B
【详解】句意:——看来要下雨了。你出去的时候最好不要让窗户开着。——谢谢你。考查had better的用
法。had better (not) do“最好(不要)做某事”,结合“It seems that it is going to rain.”可知,要下雨了,所
以不要让窗户开着。故选B。
34.C
【详解】句意:你最好不要开电视。该吃晚饭了。考查had better的用法。根据“It’s time for supper.”可知,
最好不要开电视;had better not do sth.表示“最好不要做某事”。故选C。
35.D
【详解】句意:你最后不要吃太多巧克力,否则你会变胖的。考查“had better”用法。had better译为“最
好”,相当于情态动词,后加动词原形,排除B和C选项。根据句意可知为“最好不要”,因此用否定形
式,在“had better”后直接加“not”。故选D。
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