(共3张PPT)
情态动词有一定的意义
无人称和数的变化
通常不带to
表示说话人的语气或情绪
肯定的程度
100% sure: He is sick.
95% sure: He must be sick.
Less than 50% sure:
He may be sick.
He might be sick.
He could be sick.(共5张PPT)
need to do
“需要做某事”
You need to remain in bed.
needn’t + V
“不必干某事”
You needn’t remain in bed.
needn’t have+-ed
“本没有必要做…”
He needn’t have left home at 6:00; the train doesn’t start till 7:30.
dare to do
dare not do
dared to do
didn’t dare do
Dare he do… (共6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 + -ed
本应该做…(却没有做）
You ought to have told
him that the paint on
that seat was wet.
She shouldn’t have
opened the letter ;
it wasn’t addressed
to him.
本不该做…(共11张PPT)
can/could 表示许可
I can take a day off
whenever I want.
Can Tom use the car
Can指可能性
Certain things in the home can be dangerous, especially if you have young children.
Can & be able to
表示能力
Can you type
Are you able to type
在过去时中的区别
Although the pilot was
badly hurt, he was
able to explain what
had happened.
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could
Tom has started an exercise program. He was able to run two miles yesterday without stopping.
在否定句中，could与was/were able to 没有区别
Tom couldn’t run
(wasn’t able to run) five miles yesterday.
Our baby will be able to walk in a few weeks.
Since his accident he hasn’t been able to leave the house.
can’t /couldn’t
“不可能…”99% sure
Child: Can I have some sweets I’m hungry.
Mother: You can’t/couldn’t be hungry. You’ve just had dinner.
can/could have + -ed
可能发生过…
The money has disappeared.
Who could have taken it (共6张PPT)
May：征求对方许可
May I use your car
may的推测用法
He may/might be in the library.
may/might not“可能不”
can/couldn’t “不可能”
He may/might not be driving the car.
Perhaps he isn’t driving the car himself.
He couldn’t/can’t be driving the car himself.
This is impossible. He can’t drive.
A: Look! Someone is coming. Who can it be
B: It may be the headmaster.
A:It can’t be him.He has gone abroad.
B:It must be Mr.zhang. He looks exactly like the headmaster.
注：1. may/might 在疑问句中表示请求
2.表示 “不可能 ”用can’t(共2张PPT)
modal verbs(情态动词）
May
Can/could/be able to
Must/have to
Need/dare
Ought to/should
Will/shall
Would/used to
Exercises(共10张PPT)
全国高考试题回放
1.A left—luggage office is a place where bags ____be left for a short time, especially at a railway station.
A.should B.can C.must D.will
2.How ___ you say that you really understand the whole story if you have covered only part of the article
A.can B.must C.need D.may
3.—The room is so dirty._____ we clean it
--Of course.
A.Will B.Shall C.Would D.Do
B
A
B
4.My English-Chinese dictionary has disappeared. Who ___ have taken it
A.should B.must C.could D.would
5.—Is John coming by train
---He should, but he ____ not. He likes driving his car.
A.must B.can C.need D.may
6.—I heard they went skiing in the mountains last winter.
--It ____ true because there was little snow there.
A.may not be B.won’t be
C.could’t be D.mustn’t be
C
D
C
7.It has been announced that candidates _____ remain in their seats until all the paper have been collected.
A.can B.will C.may D.shall
8.—I hear you’ve got a set of valuable Australian coins.___ I have a look
--Yes, certainly.
A.Do B.May C.Shall D.Should
9.Oh, I’m feeling well in the stomach, I ____ so much fried chicken jusf now.
A.shouldn’t eat B.mustn’t have eaten
C.shouldn’t have eaten D.mustn’t eat
D
B
C
10.I was really anxious about you. You ___ home without a word.
A.mustn’t leave B.shouldn’t have left
C.couldn’t have left D.needn’t leave
11.You can’t imagine that a well-behaved gentlemen ___ be so rude to a lady.
A.might B.need C.should D.would
12.—Write to me when you get home.
--__________.
A.I must B.I should C.I will D.I can
B
C
C
13.Mr.Bush is on time for everything. How ___it be that he was late for the opening ceremony
A.can B.should C.may D.must
14.—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
15.My sister met him at the Grand Theatre yesterday afternoon, so he ___ your lecture.
A.couldn’t have attended B.needn’t have attended
C.mustn’t have attended D.shouldn’t have attended
A
D
A
16.Sorry, I’m late. I ____ have turned off the alarm clock and gone back to sleep again.
A.might B.should C.can D.will
17.There was a lot of fun at yesterday’s party. You ___ come, but why didn’t you
A.must have B.should C.need have D.ought to have
18.—When can I come for the photes I need them tomorrow afternoom.
--They ___ be ready by by 12:00.
A.can B.should C.might D.need
A
D
B
19.—I stayed at a hotel while in New York.
--Oh, did you You ___ with Barbara.
A.could have stayed B.could stay
C.would stay D.must have stayed
20.The fire spread through the hotel very quickly but everyone ____ get out.
A.had to B.would C.was able to D.could
21.Jack ___ yet, otherwise he would have telephoned me.
A.mustn’t have arrived B.shouldn’t have arrived
C.can’t have arrived D.needn’t have arrived
A
C
C
22.When he was there, he ___ go to that coffee shop at the corner after work everyday.
A.would B.should C.had better D.might
23.Sir, you ___ be sitting in this waiting room. It is for woman and children only.
A.oughtn’t to B.can’t C.won’t D.needn’t
24.It’s nearly seven o’clock. Jack ___ be here at any moment.
A.must B.need C.should D.can
25. I wonder how he ___ that to the teacher.
A.dare to say B.dare saying C.not dare say D.dared say
A
A
D
C
26.I told Sally how to get here, but perhaps I ____ for her.
A.had to write it out B.must have written it out
C.should have written it out D.ought to write it out
27.Michael ___ be a policeman, for he is much too short.
A.needn’t B.can’t C.should D.may
C
B(共7张PPT)
used to / would
used to表达存在于过去但现在不再存在的一种习惯或情况
Jack used to live in Chicago.
Used to表达过去存在的某种情况时，would不能替代它。
I used to live in California.
They used to have a Ford.
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.(共18张PPT)
1.---When Can I come for the photos I need them tomorrow afternoon.
---They ___ be ready by 12:00.
can B. should
C. might D. need
2.---Could I call you by your first name
---Yes, you _____.
A. will B. could
C. may D. might
3.The fire spread through the hotel very quickly, but everyone ___ get out.
A. had to B. would
C. could
D. was able to
4.Johnny, you ___ play with the knife, you ___ hurt yourself.
won’t; can’t
mustn’t; may
should; must
can’t; shouldn’t
5. ---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. can
7.---Shall I tell John about it
---No, you ___, I’ve told him already.
needn’t
wouldn’t
mustn’t
shouldn’t
8.Peter ___ come with us tonight, but he isn’t very sure yet.
A. must B. may
C. can D. will
9.A computer ___ think for itself, it must be told what to do.
A. can’t
B. couldn’t
C. may not
D. might not
10. Where is my pen
I ___ it.
A. might lose
B. would have lost
C. should have lost
D. must have lost
11.---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 rather
12.He ___ you more help, even though he was very busy.
A. might have given
B. might give
C. may have given
D. may give
13.I thought you __ like something to read, so I have brought you some books.
A. may B. might
C. could D. must
14.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’t
16.---May I go there before lunch
---No, ___.
A. you mustn’t
B. you may not
C. you’d better not
D. all the above
17.---___ we go out for a walk
---Good idea. What time shall we meet
A.Shall B. Let
C. Will D. Must(共8张PPT)
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 must wipe your feet when you come in.
Child:
Do I have to wipe my feet every time I come in
had to
have got to=
have to
will have to
mustn’t “不得做某事”
You mustn’t tell George.
=Don’t tell George.
don’t have to=needn’t
“不必要…”
You don’t have to tell George.
=It isn’t necessary to tell him.
must表示可能性
He has a house in London and another in Paris, so he must be rich.
must have+-ed
“一定发生过…”
He must have taken sleeping pills last night. He didn’t wake up till lunch time.(共4张PPT)
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允诺；
Shall I open the window
Shall he come in or wait outside
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’ll get it.
