(共15张PPT)
情态动词
的用法
一、作用:表推测
时态 句式 现在,将来 过去
肯定句
否定句或疑问句
must+ do肯定
may\might+ do不确定
must\may\might
+ have done
can\could not+do
can\could not+have done
特殊用法:
有时可用于肯定推测的情态动词还有
①can \ could(表理论上的可能性) “有的时候会”
②should (表有一定根据的推测)“理所应当会”
▲Don’t worry. I have just sent an ambulance to your location. They ___ be there any second.
A. could B. might C. would D. should
▲Peter ___be really difficult at times even though he is a nice person in general.
A. shall B. should C. can D. must
A
C
③ may \ might not (语气弱于can\could) “也许不”
▲--Why didn’t Alex attend the party yesterday evening
-- He ___ not have wanted to see me.
should B. might C. could D. would
▲ Liza ___ well not want to go on the trip– she hates traveling.
A. will B. can C. must D. may
B
D
▲He must be reading, ______ he
▲You must do it yourself, _____ you
▲He must have gone over the article, _______ he
▲It must have rained last night, ________it
表猜测语气的反意疑问句的构成
isn’t
don’t
hasn’t
didn’t
can\ could (一般的能力)
① 表示一般的能力
(联想:be able to do 特殊能力、克服困难达到、将来具备的能力)
二 、分类介绍
②表许可
--Could I come here again tomorrow
-- Yes,__________.
-- No, ___________.
③could (not) have done “本可以做却没做”
We _______________ (go) there on foot. A taxi wasn’t necessary at all.
you can.
you can’t
could have gone
may\ might
①表许可,译“可以”
--May\Might I use your phone
-- Yes,__________________.
-- No, ______________________.
②may+主语+do,表“祝愿”
May all your dreams _____ (come true)
③may well (not) + do“很可能”
④may as well\might as well+ do “最好、到不如”
▲Her appearance has changed so much that you
_________________________ (recognize) her.
▲ You _____________ (stay) here over the night.
你最好留在这里过夜。
you may\ please
you may not\ please not
may well not recognize
might as well stay
must\ have to
①“必须”
must 主观看法
have to do 客观需要
I don’t like to stay here any longer, I________ leave now
It is too late. I ____________ leave now.
--Must we send in our plan this week
-- Yes, ___________________.
-- No, you ___________________________.
must
have to
you must
needn’t\ don’t have to
★must not “不许、禁止” 表示绝对禁止,不可用来由must 提出的问句。
You _________ take the books out of the reading room.
mustn’t
② Why must it rain on Sunday
The car must break down just when I was about to start.
③ All man must die.
④ It must be raining outside.
翻译must
非要、偏要
必然
一定
①用于第一人称表将来。
I shall go to work after I have finished school.
②用于一、三人称疑问句,表征求对方意见或向对方请求。
--Shall he come in
-- Come in, please.
③用于二、三人称陈述句,表示保证、承诺、威胁、警告。
You shall be punished if you insist on doing it this way.
④用于所有人称,表规章、法令等 “必须”
Each competitor shall wear a number.
shall
(1)表示有一定根据的推测、推论。“应该会”
The light is on now, they should be here .
(2)说话人的感情。如惊奇、愤怒、失望等、“竟然”
You can’t imagine that well-behaved gentleman should be so rude to a lady.
(3) 表示义务、责任或劝告、建议、命令等。“应该”
You should be more patient.
(4) If she should know the truth, she would be greatly depressed.
should (ought to do)
will\ would
表意愿
Do what you will.
表请求
Would you open the window, please
表习惯倾向性“就是、总是”
The door won’t open.
表习惯特征过去常常
When he was young, he would smoke.
He used to live in the country.
need\ dare(即是情态动词也是实义动词)
--Need I tell him everything that is happened to his parents
Do I need to hand in the paper
You didn't need to hand in the paper.
You needn’t have handed in the paper.
I dare say. 我认为。
Dare you go out alone
Do you dare to go out alone
-- Yes, you must.
--No, you needn’t.
二,表虚拟
译成“本…(但实际上没发生)”could/should/ would/ might/needn't have done.
didn’t need to do
Eg: You should have come here five minutes earlier.