课件27张PPT。can,may,mustI can play hula hoop. Can you play hula hoop?Yes , I can.No, I can't .疑问式与否定式:Can 表示能力,过去式: could1.can只有现在式和过去式，而be able to
可以用于各种时态。Can (could)表能力时，
可用be able to 代替。 Can & be able toCan you fish?Are you able to fish?Our baby ___ __ _____ ____
walk in a few weeks.我们的宝宝几个星期后
将能走路了.will be able toSince his accident he ___ ____ ______ _____
walk.自他出了事故以来, 他一直
没能走路.hasn’t been able to在过去时中的区别如果谈论过去某个时间
有能力且做到了某事，
用was/were able to
而不是couldAlthough the pilot was
badly hurt,he_____ explain
what had happened.
A. could B. was able to但他仍能解释清所发生的一切Can/Could指可能性 Can 表示推测时，用于否定句和
疑问句或感叹句中。
could表示推测 时, 可能性比can小，
不表示时态。但可用于肯定句.They can’t be in the
office now.He couldn't be a bad man .
He can't be a bad man . He could be busy now.may/ might他不大可能是坏人。他不可能是坏人。Can it be true?
它可能是真的吗？Can/Could he be a bad man ?
他可能是坏人吗？ （不如may正式，常用于口语） can/could表许可You can take a day off
whenever you want. Can Tom use the car? Yes, he can.No, he can’t.Could 表许可, 只表示委婉
的语气, 不表示时态.---Could I use your bike?---Yes, you can.
Go ahead, please.
Help yourself.May：征求对方许可May (Might) I use
your car?Yes, you may.No, you mustn't. 必背:
May I…? 的回答还有下列方式:
Yes ,of course/certainly .
Sure./ Go ahead please.
No, you must not. （强烈终止） No, you can‘t .
（口语上多用这一句型） may的推测用法He may/might be in the library.(用于肯定句）might表推测时，不表示时态，
只是说明可能性比may还要小。 may not 表推测是 “可能不” 之意.They can’t come tonight.
They may not come tonight.Must表必要性(用于肯定句,
疑问句)You must buy a ticket. 在You must～ .这一名句型中，
它的意思一与祈使句相同。You must get up early.=Get up early.Must I live here?Yes ,you must.No, you needn't.=No, you don't have to . must & have to must侧重于说话人的 主观看法
have to侧重于客观上的需要，“不得不”Mother:
You _______ wipe your feet when you come in.
Child:
Do I _______ ___ wipe my feet every time I come in?musthave toHe must be sleeping .must表示推测,一定、
准是,一般只用于肯定句中He has a house in London and another in Paris, so he must be rich.You didn’t eat much this morning. You should be hungry by now.should 也可表示推测，语气较肯定，表示“很可能”“该会”，得出尝试性结论。A: Look! Someone is coming. Who _____ it be? B: It _____ be the headmaster.
A: It _____ be him. He has gone abroad.
B: It _____ be Mr zhang. He looks like the headmaster.May/can/can’t/must ?canmaycan’tmust must have done…
“一定发生过…”
He must have taken sleeping pills last night. Can/may/must+完成式
都表示对过去的状态或动作进行推测
他昨天晚上一定服了安眠药 can/could have done… 可能发生过…The money has
disappeared. Who could
have taken it?钱不见了.会是谁拿了呢?不同的“肯定”程度可按下列层次排列：
He ___ at home. (事实)
He ____ ____ at home.
He _____ ____ at home.
He _______ ____ at home.
He ___ _____ at home.
He ______ ___ at home.
He _______ ___ ___ at home.
He ___ ____ ___ at home.
He ________ _____ at home.
He ______ ____ at home.
He ______ at home.（事实）
ismust becould beshould bemay bemight bemight not bemay not becould not becan’t beisn’tAnyone can make mistakes. 表示客观上或理论上可能发生
的事情,can也可用于肯定句.任何人都有可能犯错误He must be in the office now,
He must have arrived there last night,
They must have been good friends for years,
He can’t have been to Beijing, isn’t he?didn’t he?haven’t they?has he?课件16张PPT。Exercises --Are you coming to Jeff’s party? --I’m not sure. I ____go to the concert instead A. must B. would C. should D. might -- _____the news be true? -- No, it _____ be true. A. Can, can’t B. May, can’t C. May, may not D. Must, mustn’tYour English teacher looks
very young; He ____be over 30.
A. mustn‘t
B. can‘t
C. won‘t
D. may not
____ you tell me what has happened?
A. May
B. Must
C. Might
D. Could You___ hand it in at once;
you may hand it in tomorrow.
A. needn't B. may not
C. can't D. must not
That must be a mistake.“
"No it a mistake.“
A. must not be
B. needn't be
C. cannot be
D. would not be
___ I water the trees on Tuesday?
No, you needn't.
A. Can B. Must
C. May D. Shall
The fire spread through
the hotel quickly, but everyone ___ get out.
A. had to B. would
C. could D. was able to We didn't see him at the lecture
yesterday. He ____ it.
A. mustn't attend
B. cannot have attended
C. would have not attended
D. needn't have attended
--Could I borrow your dictionary? --Yes, of course you____. A. might B. will C. can D. should --Must I start at once? --No, you____. A. don’t have to B. mustn’t C. can’t D. won’t --Need I hand in my exercise book at once? --Yes, you_____. A. must B. need C. can D. will
--Where is my pen?
-- I _____it.
A. might lose
B. wouldn’t have lost
C. should have lost
D. must have lost The light in his room is still on, so he _____ to bed. A. mustn’t have gone B. must have gone C. shouldn’t have gone D. can’t have goneSorry I’m late. I______ have
turned off the alarm clock
and gone back to sleep again.
A. might B. should
C. can D. will
课件21张PPT。2.---Could I call you by your first name?
---Yes, you _____.
A. will B. could
C. may D. might3.The fire spread through the hotel very quickly, but everyone ___ get out.
A. had to B. would
C. could
D. was able to4.Johnny, you ___ play with the knife, you ___ hurt yourself.
won’t; can’t
mustn’t; may
should; must
can’t; shouldn’t5. ---There were already five people in the car but they managed to take me as well.
---It ___ a comfortable trip.
can’t be
shouldn’t be
mustn’t have been
couldn’t have been.6. It’s nearly seven o’clock. Jack ___ be here at any moment.
must B. need
C. should D. can7.---Shall I tell John about it?
---No, you ___, I’ve told him already.
needn’t
wouldn’t
mustn’t
shouldn’t8.Peter ___ come with us tonight, but he isn’t very sure yet.
A. must B. may
C. can D. will9.A computer ___ think for itself, it must be told what to do.
A. can’t
B. couldn’t
C. may not
D. might not10. Where is my pen?
I ___ it.
A. might lose
B. would have lost
C. should have lost
D. must have lost11.---Shall we go skating
or stay at home?
---Which ___ do
yourself?
A. do you rather
B. would you rather
C. will you rather
D. should you rather12.He ___ you more help, even though he was very busy.
A. might have given
B. might give
C. may have given
D. may give13.I thought you __ like something to read, so I have brought you some books.
A. may B. might
C. could D. must14.The plant is dead.
I ___ it more water.
A. will
B. would have given
C. must give
D. should have given 15.---Will you stay for
lunch?
---Sorry, ____. My
brother is coming
to see me.
A. I mustn’t B. I can’t
C. I needn’t D. I won’t16.---May I go there before lunch?
---No, ___.
A. you mustn’t
B. you can not
C. you’d better not
D. all the above17.---___ we go out for a walk?
---Good idea. What time shall we meet?
A.Shall B. Let
C. Will D. Must18.____you mind my smoking here?
A. Should
B Could C. Might
D. WouldIt has been announced that candidates___ remain in their seats until all the papers are collected.
A. can B. will C. may D. shall-Will you stay for lunch?
-Sorry, _____. My brother is coming to see me.
I mustn’t
B. I can’t
C. I needn’t
D. I won’t--Sir, ____ he go or stay?
--Let him go.
will
B. shall
C. might
D. couldRonald ______ stay in his small garden for
a long time every day in the past.
could
B. might
C. should
D. would课件2张PPT。情态动词高三英语复习(6)Can/may/must
Need/dare
Ought to/should
Will/shall
Would/used to
Exercise 1
Exercise 2课件4张PPT。可兼做行为动词的情态动词：need 、 dare 情态动词 (+动词原形)行为动词 . needdare 1.无人称和数的变化; 2.用于：*否定句及疑问句中;*在if/whether之后; 3.常以needn’t 和daren’t
的形式出现;4.dare有其过去时dared. 用于肯定句,否定
句及疑问句中;
你明天不必/需要早起.You don’t need to get up early.
You needn’t get up early.
You need to get up early.
Do you need to get up early?
Need you get up early?
I didn’t dare to go home yesterday.
I dared not go home yesterday.昨天我不敢回家.注意对need问句的回答:
--Need I finish the work today?
--Yes, ________________.
No, ________________.
No, _____________________.you mustyou needn’tyou don’t have toneedn’t + V “不必干某事”needn’t have+-ed“本没必要做…”He needn’t start now.
He needn’t have started at 6:00.课件5张PPT。 ought to & should ought to
“有责任、有义务做某事”You ought to start the work at once.
你得立即开始工作。 should“劝告、建议”You should start the work at once.
你应当立即开始工作。 ought to语气稍重一些 ought to/should
“非常有可能”It is Saturday afternoon. They ought to/should be back home.ought to& should have done…
本应该做…(却没有做）You ought to have told him that the paint on that seat was wet.
你本应告诉他座位上的油漆未干She shouldn’t have opened
the letter ; it wasn’t addressed
to him.
她不应该拆信的,信不是写给她的
本不该做…课件9张PPT。Shall作为助动词，一般用于第一人称Ⅰ
和We，，构成将来时态。
（1）I shall think it over and
Let you know my idea.
我将考虑一下此事，然后告诉你我的想法。 （2）We shall have a good time
in the park.
我们在公园里会玩得很高兴的。 shall用在主语是第一和第三人称的疑问句中表示征求对方的意见,由对方作出决定 …. 好吗?...要不要…?Shall I open the window?
Shall he come in or wait outside?
May I open the window?另外，在Let‘s的祈使句中，其反意疑问句用
Shall we。
Let‘s make it a little earlier，
__________?
但: Let us make…, ___________?shall wewill youshall用于第二、三人称，表示许诺、
答应、命令,强制等。
If he passes the exam
he shall have a holiday.
The law shall come into
effect on May 1st. will用在主语是第二人称的疑问句中，表示“请求”Would you pass the salt, please?
Will you please pass the salt?will用于主语是各人称的陈述句中，表示“意愿、倾向”
---The phone is ringing.
I______ answer it.
A. will B. am going to
This window _____ open.
这扇窗户经常打不开。
won’tWill/would 表示习惯性,经常性发生的动作.
My father would tell us stories after supper when we were young.
used to used to表达存在于过去但现在不再存在的习惯或情况Jack used to live in
Chicago, _____________?
__________ ? usedn’t hedidn’t he课件3张PPT。 used to / would used to表达存在于过去但现在不再存在的习惯或情况Jack used to live in
Chicago.would可以用于表达过去定期重复的一个动作。
表达这个概念时，would 和 used to 相同。When I was a child, my father would / used to read me a story at night before bed.
