一轮英语语法之八:情态动词
【预习案】
情态动词的特性
不能单独充当谓语,后接______________。
无_________________形式。
部分情态动词无过去式。
可用作助动词。
基本含义:
情态动词 词义 情态动词 词义
can/could 能,能够,可能 should/ought to
may/might shall
must will/would
need dare
had better have to
常见用法:
用于请求与询问
May/Might/Could/Can I...
Would you (please)…/Would you mind…
Must/Need I…
Shall I/we/he…
表推测
选词
表推测的情态动词 可能性大小 备注
will/be going to 100%
can’t/couldn’t 99% can用于肯定句表客观可能
must 95% 只用于肯定句
should/ought to 90% 根据常识推断
may/might/could 50% may/might 不用于疑问句
may/might not 翻译成:可能不
It can be very warm in this area.
It's 9:30 .I think she ___________ be in her office.
That restaurant ____________ be very good. It’s always empty.
时间观念
+do/be 对现在情况的推测
+be doing 对现在正在进行的动作的推测
+have done 对过去发生的事情的推测
填空:
I can’t find my ticket, I think I must __________(lose) it.
Judging by her clothes, she must ___________ very rich.
虚语气中的运用
should (not) have done sth. 本应该做某事却没做/本不该做某事却做了
could/might have done sth.
needn’t have done sth.
特殊的情态动词
情态动词 实义动词
肯定 否定
need 不用于肯定句 need/dare (not) do sth need to do sth
dare dare to do sth
固定搭配
may/might as well ______________________
would rather do…, would prefer/like to do…
can’t …too…/enough __________________________
can’t help/resist doing sth. ______________________
can’t but do sth.
can’t wait to do ________________
before sb can… _____________________
I dare say. ___________________
do all/what/everything sb can to do sth _________________________
【当堂训练】
选择题
(2017北京卷) Samuel, the tallest boy in our class, ____ easily reach the books on the top shelf.
A. must B. should C. can D. need
(2017天津卷2) My room is a mess, but I __________clean it before I go out tonight. I can do it in the morning.
A. daren’t B. shouldn’t C. needn’t D. mustn’t
【2016·北京】 I love the weekend, because I ________ get up early on Saturdays and Sundays.
A. needn’t B. mustn’t C. wouldn’t D. shouldn’t
【2016 浙江】 George _________ too far . His coffee is still warm .
A. must have gone B. might have gone C. can't have gone D. needn't have gone
【2014·陕西卷】 My book, The House of Hales, is missing. Who ________ have taken it
A. need B. must C. should D. could
【2021年天津卷第一次】It used to be that you ______ drive for miles here without seeing another person, but now there are houses and people everywhere.
A.need B.should C.could D.must
【2021年天津卷第二次】 ---I honestly don't think I'm going to be admitted.
---Wel1, you never know! You________ a better impression than you think.
A. may have made B. should have made
C. couldn’t have made D. needn't have made
【2020·天津】Jim says we ______ stay in his house as long as we leave it clean and tidy .
A.must B.can C.need D.should
【2020·天津】You ____________ have scolded him for his poor performance. After all, he had done his best.
A.must B.should C.mustn’t D.shouldn't
填空:
When I was a child, I ________ watch TV whenever I wanted to.
The police haven’t found the lost child, but they’re doing all they _________.
If you don’t want to go swimming, you ________ as well stay at home.
I like the author so much that I __________ wait to read his new book.
You __________ be too careful when crossing the street.
The poor postman was fired before he _________ account for his fault.
It is usually warm in my hometown in March,but it ________be rather cold sometimes.
If you ________go,at least wait until the storm is over.
单句改错:
Some classmates suggest we can go to places of interest nearby.
We can chose between staying at home and taking a trip.
Do I need leave my telephone number and address
I mustn't use a clock to wake me up because at six o'clock each morning the train comes by my house.
But in fact, Gorka can quite shy, even around the people he has known for a while.
As for the consumers, they had better have their own judgment and not were puzzled by ads.
He may have given you more help, even though he was very busy.
【巩固练习】
选择
【2015·北京】—Can’t you stay a little longer
—It’s getting late. I really _____go now, My daughter is home alone.
A .may B .can C . must D .dare
【2015·重庆】You ____ be Carol. You haven’t changed a bit after all these years.
A. must B. can C. will D. shall
【2015·浙江】It was so noisy that we __________ hear ourselves speak.
A. couldn’t B. shouldn’t C. mustn’t D needn’t
【2015 天津】I ______ have worried before I came to the new school, for my classmates here are very friendly to me.
A. mightn’t B. mustn’t C. needn’t D. couldn’t
【2015·四川】You _____be careful with the camera. It costs!
A .must B. may C. can D. will
【2015·陕西】You __________ feel all the training a waste of time, but I’m a hundred percent sure later you’ll be grateful you did it.
A. should B. need C. shall D. may
【2015·福建】—Sorry, Mum! I failed the job interview again.
—Oh, it's too bad. You ________ have made full preparations.
A. must B. can C. would D. should
【2018年北京卷】 In today’s information age, the loss of data _________ cause serious problems for a company.
A. need B. should C. can D. must
【2018年江苏卷】 It’s strange that he _______ have taken the books without the owner’s permission.
A. would B. should C. could D. might
【2018年天津卷】 I can't find my purse. I___________ it in the supermarket yesterday, but I'm not sure.
A. should leave B. must have left C. might leave D. could have left
改错
We must found ways to protect our environment.
I dare not to face the danger bravely.
You shouldn't have bought so much food, because I have prepared everything we need for the picnic.
You had better not to come here tomorrow.
You mustn’t do the exercise if you don’t want to.
填空
—No one ________be compared with Yao Ming in playing basketball.
—Oh,you are really his big fan.
It ________be the postman at the door. It's only six o'clock.
I ________worry about my weekend—I always have my plans ready before it comes.
Just be patient.
You ________expect the world to change so soon.
—May I take this book out of the reading room
—No,you ________.You read it in here.
You ________park here!It's an emergency exit.
—I don't really like James. Why did you invite him
—Don't worry. He ________not come. He said he wasn't certain what his plans were.
—I left my handbag on the train,but luckily someone gave it to a railway official.
—How unbelievable to get it back!I mean,someone ________ have stolen it.
It ________have been Tom that parked the car here,as he is the only one with a car.
What do you mean,there are only ten tickets?There ________ be twelve.