2021届高考二轮英语复习课件：情态动词知识点讲解课件(58张ppt)

Modal Verbs
Grammar and usage
情态动词
He ________ be our manager because hehas gone to Beijing.
I ________ thank you too much for all your help.
You ________ be hungry after a long walk for two days.
________ you be happy every day！
It ________ be quite cold here in winter.
He ________ well stay in Beijing now.
You ________ (不妨) tell him the truth.
If you ________ go, at least wait until the storm is over.
He fell into the lake, but he ________ swim to the bank.
You ________ play with the knife, or you ________ hurt yourself.
I hope that everyone will ________ pass the English exam next time.
There is someone at the door. Who _________it be?
1.We must know all these，if the book is to speak its whole message.
2.A hundred men may pass a field and see only dead grass...
3.To achieve this，it should contain two elements: universal interest and personal style.
4.It also takes on a personal style—no writer can describe human life without reflecting his own life and experiences.
必须 necessity
可能 probability
应该 suggestion
能够 ability
What is modal verb?
What are the functions of modal verb?
What modal verbs do you know?
can could
may might
must ought to
shall should
will would
dare need have to used to
can & could
My grandmother __________ do some shopping on the Internet, The building was on fire, but luckily everyone in it ___________
escape from it.
Mary __________ play piano. She _____________ play it since she was five.
You'll ____________ get a taxi outside the station.
can/is able to
was able to
can/is able to
has been able to
be able to
can/could 表示能力(ability), 意思相当于 be able to
注意：
在一般过去时中，was / were able to 通常表示能做并且已经做了的事，could 仅表示能力。
Be able to可用于各种时态中，can只能用于一般现在时和过去时
can & could
___________ you give me a hand with the box?
----Could I use your car?
----Yes, of course you _______.
---- No, _________
Can/Could
can
2. can/could 表示 “请求” 和“许可”
注意：could语气更委婉，肯定回答时要用can，不用could。
you can’t. / I’m afraid not.
can & could
They often go to the restaurants for meals. They _____ be very poor.
Where ______ he have gone?
3. 表“可能性” 时，can多用在否定句或疑问句中, 表示主观推测。
can’t
can
can & could
The temperature here _________ be as high as 37℃.
As a human being, anyone _________ make a mistake.
can
can
4. can用在肯定句中多表示理论上的可能，“经验之谈”，含有“有时会”的意思。
can & could
can't ... too/enough 无论……也不过分；越……越好
can't (help) but do sth. 不得不，只好
can't help doing sth. 禁不住做某事
You can’t be too careful while crossing the road.
I can’t thank you too much for all your help to my son.
One cannot but admire her determination.
summary
{00A15C55-8517-42AA-B614-E9B94910E393}含义
否定式
注意点
ability
“能/会”
can’t
“不会，不能”
区别 be able to
permission
“可以”
can’t
“不可以，不许”
could语气更委婉些
possibility
“可能”
can’t
“不可能”
表推测主要用于否定/疑问句中
陈述句为客观可能性
may & might
----__________ I have a few words with your manager?
----Yes, you ________.
----No, you ________.
表示请求和许可，在疑问句中，might可以代替may，它表示的语气更加委婉。
注意：may not表示“不许”时，语气较强，有命令强制的意味，常可用mustn’t/can’t 来回答问句“May I...?”
May/might
may
mustn’t/can’t
may & might
You __________ have some fever.

2. 表示把握不大的推测，意为“可能”，一般不用于疑问句。
may/might
There is someone at the door. Who _________it be?
It _______ be Mary.

can
may
may not can’t
1.That _________ be Mary— she’s in hospital.
2.Mr Smith ________ be a great player, but he’s a good captain.
possibility
不太可能会
肯定不会
can’t
may not
may & might
3. may表示祝愿，常用结构为：May＋主语＋动词原形
祝你成功！
May you !
A. succeed B. success


A
may & might
4. may/might as well do sth “还是....为好；不妨”
=had better do sth
may/might well do sth“很有可能......”
Since it is a fine day, we _______________________walk.
His appearance has changed so much that you
____________________ not recognize him.

may/might as well
may/might well
1. A computer ______ think for itself; it must be told what to do.
? ? A. can’t??????????B. couldn’t???????????????C. may not??????????????D. might not
2. I _________ swim to the bank when the ship sank.
A. may B. would? ??????????? C. could? ??????????????????D. was able to
3. — Who _____ it be that is knocking at the door?
? — It _____ be Father, but I'm not sure.
A. can, can B. can, may C. must, can D. may, must?
4. Liza ___ well not want to go on the trip --- she hates traveling.
A. will B. can C. must D. may
A
D
B
D
must & need
You mustn’t do that, because you must keep your word.
—Must I finish my homework today?
— Yes, you __________.
— No, you ___________.
表示“必要性”, 意为“必须”，其否定形式为mustn’t (不准，禁止)。
注意：must 表示一种主观的义务和必要；而have to 表示一种客观被迫需要,含有“不得不,只好”的意思。
must
needn’t/don’t have to
must
The light is still on, so he_______ be at home.
That ______ be the only way. There ________ be other ways of solving the problem.
那不可能是解决问题的唯一办法，肯定有另外的办法。
2. 表示有把握的推测，意为“一定，准是”，只能用在肯定句中，
在否定句、疑问句中要用can’t代替，表示“不可能会”
must
can’t
must
must
Must you make so much noise？
The car must break down just when I was about to start.
If you must smoke, please get out.
3. 表示感彩，意为“一定要, 偏偏，偏要”，常指令人不快
的事情。
1. You ______ be hungry already — you had lunch only two hours ago!
A. wouldn’t B. can’t C. mustn’t D. needn’t
2. Johnny, you ______ play with the knife, you ______ hurt yourself.
A. won’t ; can’t B. mustn’t ; may
C. shouldn’t ; must D. can’t ; shouldn’t
3. —May I smoke here ?
—If you ____, choose a seat in the smoking section.
A. will? B. can? C. may?? D. must
B
B
D
will & would
I _________ never do that again.
No matter how the enemy whipped her, she ________ bow her head.
___________ you give me a piece of paper?
表示意志、意愿和决心。
表示请求、建议。用于第二人称的疑问句，would表示更委婉的语气。
will
wouldn’t
Will/Would
will & would
Fish ______ die without water.
She _______ listen to music, alone in her room, for hours.
He told me the box _________ open.
We __________ sit around Grandpa after supper, listening to his stories.
3. 表示习惯性动作、固有属性或必然趋势，意为“总是；习惯于”。would指过去的习惯=used to。
will
would
will
wouldn’t
will & would
This ________ be the house you’re looking for.
That _________be in the spring of 1995.
4. 表示推测，意为“大概，也许，想必”。
will
would
shall
用于第一、三人称的疑问句中表示说话者征求对方的意见。
___________we go for a ride?
Shall
I am busy now. _____ my brother do it for you?
A. Will B. Shall C. Must D. May
B
— Daddy, can you buy me a new ipad when you go to Beijing?
— You _____ get one if you are admitted to a key middle school.?
shall
shall
2. shall用于第二、第三人称，表示说话人给对方的命令、警告、允诺。
You naughty boy! You shall get what you deserve.
shall
3. shall用于条约、规定、法令等官方文件中表示义务或规定，意为“必须；应该”。
All payments shall be made in cash.
According to the school rules, no students shall go out of school without the permission of teachers.
We ________ be strict with ourselves.我们应该严格要求自己。
It’s wonderful that you should have achieved so much in these years.
Don’t ask me. How should I know?
It is three o'clock now, the match _____ begin soon.
A. should B. will C. can D. may
should/
ought to
should
should表示责任、义务、劝告、建议，意为“应该”=ought to
should表示惊讶、愤怒、失望等特殊情感, 意为“竟然”
should表示按常理、经验进行推测，意为“按道理说应该”
But don't you know
O don't you know
The red should languish (to become weaker)
and the green must grow.
1. It's raining cats and dogs. I'm so surprised that you _____ stand outside!
A. might B. may C. shall D. should
2. —How’s your tour around the North Lake? Is it beautiful?
—It ________ be, but it is now heavily polluted.
A. shall B. would C. should D. must
3. ---What does the sign over there read?
---“No person ________ smoke or carry a lighted cigarette in this area.”
A. will B. may C. shall D. must
4. If you listen to me, you _____have some candies dear.
A. shall B. may C. will D. must
D
C
C
A
need作情态动词主要用于疑问句、否定句或条件句中。
I needn't ______(use) a clock to wake me up.
Need he _______(go) there himself?
need
use
go
need作实义动词，有人称、数、时态的变化，常用搭配：
sb need to do
sth need doing/to be done
I don't need _________(use) a clock to wake me up.
Did he need _______(go) there himself?
My watch needs______________________________(repair).
需要做某事
需要被做
to use
to go
repairing/to be repaired
dare作情态动词，后接动词原形，常用于疑问句、否定句和条件句，没有人称和数的变化.
Dare you jump off the high wall?
He daren’t even look out.
dare
dare作实义动词，有人称和数的变化；在肯定句中，用于dare to do结构，在否定和疑问句中to可省略。
Do you dare (to) jump off the high wall?
He doesn’t dare (to) look out.
Only those who dare to fail greatly can ever achieve greatly.
dare
{BDBED569-4797-4DF1-A0F4-6AAB3CD982D8}can & could
请求/许可
推测
能力
may & might
请求/许可
推测
祝愿 (may)
will & would
请求
推测
意愿，决心
习惯性动作或固有属性
must
推测
必要性
“偏偏，非要”
should
推测
责任，建议
“竟然”
shall
请求
规定，义务（法律/规章制度）
允诺、警告、决心、命令（二、三人称）
summary
{BDBED569-4797-4DF1-A0F4-6AAB3CD982D8}can & could
may & might
will & would
must
should
shall
情态动词表推测
possibility
must
would/will
may
should
might
could
may not
might not
can’t
couldn’t
uncertain
certain
certain
She may be waiting for you now.
You might have read about it in the papers.
The children must be playing outside.
Rosa must have attended the party last night.
You can’t have seen Henry yesterday because he was in London.
It is so cold today. They can’t be swimming in the river now.
情态动词表推测
对现在
对现在进行
对过去
肯定
must
+ do/be
+ be doing
+ have done
可能
may/might
+ do/be
+ be doing
+ have done
不可能
can’t/couldn’t
+ do/be
+ be doing
+ have done
情态动词表推测
1. I don't know where she is, she __________ in Shanghai. (可能在上海)
2. At this moment, our teacher___________________.（一定正在上课）
3. The road is wet. It ____________________last night. （一定下过雨）
4. Philip _________________________ seriously in the car accident. （可
能在车祸中受了重伤）
5. Mike ___________________ his car, for he came to work by bus this morning.（一定还没有找回他的车）
6. He ______________ his homework now. (不可能正在做作业）
may be
must be having class
must have rained
may/might have been hurt

can’t be doing
can’t/couldn’t have found
I really regret wasting the hours when I should have studied hard，but it is too late.
I shouldn’t have watched that movie — it’ll give me horrible dreams.
I needn't have worried before I came to the new school, for my classmates here are friendly to me.
He could have escaped, but he chose to stand and fight.
这里还是表示推测吗？
情态动词+have done
{5FD0F851-EC5A-4D38-B0AD-8093EC10F338}
could have done
oughtn't to/shouldn't have done
ought to/should have done
needn't have done
（过去）本可以做某事（但没做）
（过去）本不应该做某事（但做了）
（过去）本应该做某事（但没做）
（过去）本不需要做某事（但做了）
I really regret wasting the hours when I should have studied hard，but it is too late.
I was really anxious about you. You shouldn’t have left home without a word.
I needn't have worried before I came to the new school, for my classmates here are friendly to me.
You could have reviewed, but you played games all night.
情态动词+have done
（表后悔）
（表责备）
（表多此一举）
（表遗憾，责备）
She should have come to see me yesterday.
昨天她本应该来看我。(实际上没来)
She shouldn't have come to see me yesterday.
昨天她本不应该来看我的。(实际上来了)
He couldn’t have finished the work ahead of time.
他不可能提前完成了工作（表推测）
He could have finished the work ahead of time.
他本可以提前完成工作。 （表责备）
Comparison
情态动词+have done有两个主要用法：
①是表示对过去发生的动作或存在的状态的推测。
②是表示对过去发生的动作的遗憾或责备。
summary
{5DA37D80-6434-44D0-A028-1B22A696006F}must have done
might/may have done
can’t/couldn’t have done
could have done
should/ought to have done
shouldn’t/oughtn’t to have done
needn’t have done
表推测 （一定做了某事）
表推测 （可能做了某事）
表遗憾或责备（本可以做某事）
表推测 （不可能做了某事）
表遗憾或责备（本应该做某事）
表遗憾或责备（本不应该做某事）
表遗憾或责备（本不必做某事）
1. He is not poor. You ____ have lent him the money.
A. can’t B. needn’t C. couldn’t D. mustn’t
2. —My cat’s really fat. You ______ have given her so much food.
A. wouldn’t B. couldn’t C. shouldn’t D. mustn’t
3. I told your friend how to get to the hotel, but perhaps I ______
have driven her there.
A. could B. must C. night D. should
4. What a pity! Considering his ability and experience, he____better.
A. need have done B. must have done
C. can have done D. might have done
4.---There were already five people in the car, but they managed to
take me as well.
---It ____a comfortable journey.
A. can’t be
B. shouldn’t be
C. mustn’t have been
D. couldn’t have been
5. He did not regret saying what he did but felt that he_______it
differently.
A. need have expressed B. might have expressed
C. could have expressed D. must have expressed
Practice
Ⅰ.单句语法填空
1.It is strange that such a famous poet be so rude to a lady.
2.You come here on time, or you’ll be fined next time.
3.I have cooked so much food. Nobody was hungry.
4.When the author was young，he climb the small hill every morning.
5.I finish reading the novel tomorrow，but I am not sure about it.
6.You have given him some advice. He was too upset at that time.
7.You _______ get a gift if you go to bed right now.
should
must
needn’t
would
may/might
ought to/should
shall
8.She was so frightened that she didn’t dare (breathe) a word of it
to anyone else.
9. The garden doesn’t need _______ (water) at the moment.
10.The doorbell rings. It be Lisa, because she’s still in the library at this
time.
11.You feel all the training a waste of time, but I’m sure later you’ll be grateful you did it.
12. —It’s already 11 o’clock , and he ______ have been here half an hour ago.
—Maybe he got caught in the rain.

to breathe
can’t
may/might
watering
should
Ⅱ.完成句子
1. you in the following year!
祝你在新的一年里好运！
2.Why at noon?
他为什么偏偏中午弹钢琴呢？
3.She ________________ in person — a letter would have been enough.
她本不必亲自来——写封信来就足够了。
May
be lucky
must he play the piano
needn’t have come
4.— that left the door unlocked?
—It might be Mike. He is always forgetting things.
——是谁没锁门？
5.—The deadline is drawing near but I failed to challenge the task a third time.
— ?
——让我弟弟试一试好吗？
Who could it be
Shall my brother have a try
6. He was aware that someone ___________________ his room.
他意识到一定有什么人进过他的房间。
7. You ____________________________ here alone at such a late hour.
你这么晚的时候本不应该一个人来这里的。
must have entered
shouldn’t/oughtn’t to have come
P48
A Exploring the rules
Read the website article about how to choose books. Find the sentences that use modal verbs and fill in the table below. The first one has been done for you.
{5C22544A-7EE6-4342-B048-85BDC9FD1C3A}Suggestion
Ability
…you can get ideas from different sources…
You could also read book reviews in newspapers, in magazines or online.
Teachers in particular can provide suggestions for interesting reading materials that can be found in the library or bookshop easily.
A book review can often tell you whether a book is worth reading or not.
{5C22544A-7EE6-4342-B048-85BDC9FD1C3A}Necessity
Possibility
…what books you ought to read.
However, you must also decide for yourself what kind of books to read.
You do not have to read a book just because everyone recommends it.
You might have asked yourself this questions more than once.
These ideas should point you in the right direction.
… you may find yourself better able to seek out books to your taste…
Modal verbs can be followed by ________.
You can choose more than one answer for the blank.
a do (the base form)
b doing (the verb-ing form)
c did (the past form)
d be done (the passive voice)
e be doing (the continuous form)
f have done (the perfect form)
a d e f
Applying the rules
B1
{7DF18680-E054-41AD-8BC1-D1AEF772440D}Question
Choice
Function
Function of the modal verbs in the other sentences.
1
a
Permission
Ability
2
c
Permission
Possibility
3
b
Possibility
Necessity
4
c
Necessity
Possibility
{7DF18680-E054-41AD-8BC1-D1AEF772440D}Question
Choice
1
can’t
2
must
3
could
4
must
5
can
6
should
7
ought to
B2
Applying the rules
Useful phrases and sentences
P48
1. develop your own taste
2. in particular
3. tell you whether a book is worth reading or not
4. These ideas should point you in the right direction.
5. Take time to look through the collections.
6. come across
7. find yourself better able to seek out books to your taste
P49
It turned out the exact opposite.
I could not stop turning the pages!
reflect on these moment
weave
V. 织
weave-wove-woven
Most spiders weave webs that are almost invisible.
The women shut themselves behind closed doors to weave their cloth.
hand-woven scarves
weave
v.迂回行进，穿行（以避开障碍）
weave-weaved-weaved
She was weaving in and out of the traffic.
The road weaves through a range of hills.
He had to weave his way through a crowd.