情态动词[下学期]
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课件17张PPT。情态动词must can / could may / might
表示推测 的用法情态动词 must, may/ might, can/ could 可以用来
表示对过去， 现在和将来情况的推测和判断：
1. Must表肯定性较大的推测,意为“一定”,一般用于
肯定句中
2. May / might 则表示推测的语气不确定,用 may 表示
“ 也许,可能” might 语气比may 弱, 表示“或许,大概”
一般不用于疑问句中
3. Can / could 经常用在否定句或疑问句中,表示否定
的推测和判断. 有“不可能”之意. can’t 比couldn’t
语气强.------- Look, someone is coming. Who ______ it be ?
-------It _____ be our headmaster, I’m not sure.
------No, it ______ be him. He has gone to Shanghai.
------Oh, it _____ be Mr. Li. He is very alike our headmaster.canmaycan’tmust二. 情态动词表示对现在或将来情况的推测时,在
情态动词 后加动词的原形：
1. I have just called on him. He must study at home now.
2. He must be very busy because he has a lot of work to do
3. The boy is honest. He can’t lie.
4. There is no light in the room. She can’t be at home.5. ---- Are you going to Jeff’s party?
----- I’m not sure. I ______ go to the concert instead.
A. must B. would C. could D. might
6. I thought you______ like something to read, so I bought
you some books.
A. may B. might C. could D. must
DB三. 情态动词表示对过去情况的推测或判断时,在
情态动词后“ have + 过去分词”形式：
1. The road is wet. It must have rained last night.
2. He can’t have worked at the office last night, for he
had to go to a party at six in the afternoon.
3. They must have been too excited to sleep last night,
for they met with China’s first spaceman Yang Li wei.4. Tom worked here for two weeks . He may/ might
have known it.
5. The light is still on. They ____ to turn it off when they
left.
A. must forget B. must have forgotten
C. may forget D. could have forgottenB三. 情态动词表示对现在进行情况的推测时, 在
情态动词后加 “be + 现在分词” 形式：
1. The girl is not out. She must be doing her homework now.
2. It is twelve o’clock now. He must be having lunch now.
3. Mary can’t be playing the piano now. She went to the
shop with her mother a few minutes ago.Exercises:
1. --- Why ! I could n’t get you on the phone this morning.
----- We ____ tennis in the yard when you phoned.
A. must be playing B. could be playing
C. must have played D. must have been playingD2. ----- Why does Bob know so much about New Zealand?
------ He ______ , or……..
A. must have been there B. might visit it
C. may have been there D. can’t visit it
3. Jack ____ yet, otherwise he would have phone me.
A. must n’t have arrived B. should n’t have done
C. can’t have arrived D. need not have arrived
CC4. I _____ asleep . Because it took me a long time to realize
that the telephone was ringing.
A. could have fallen B. should have fallen
C. must have fallen D. must n’t have fallen
C5. I parked my car right here but now it’s gone. It_________.
A. must be stolen B. must have stolen
C. may be stolen D. must have been stolenD6.--- Is John coming by trains?
----- He should, but he_____ not. He likes driving his car.
A. must B. can C. need D. may 7. ---- Is there a flight to London this evening?
----- There____ be. I will phone the airport and find it out.
A. must B. would C. might D. canDC8. ----A man answered the phone, I supposed it was
her husband.
----- It ________ her husband. He has been dead for years.
A. must n’t be B. must n’t have been
C. could n’t be D. could n’t have been
DA9. --- Who____ it be that is knocking at the door?
------ It _________ be father, but I’m not sure.
A. can, may B. may, can
C. may, must D. need, should10. ---- What do you suppose happened to him?
-----I don’t know. He _________ lost.
A. might get B. can have got
C. may have got D. will get
CA11. You must be tired, _______?
A. are n’t you B. must n’t you
C. are you D. must you
12. You must have met her yesterday_________?
A. must n’t you B. did n’t you
C. haven’t you
BC13. You must have seen the new film______ ?
A. must n’t you
B. did n’t you
C. have n’t you
14. I’m sure there_______ be over 2 000 students in their
school.
A. must B. may C. might D. canA15. Peter________ come with us tonight, but he is n’t
very sure yet.
A. must B. may C. can D. willB16. My English– Chinese dictionary has disappeared.
Who __________ have taken it?
A. should B. must C. could D. wouldC17. ----- 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 n’t be D. must n’t beC
表示推测 的用法情态动词 must, may/ might, can/ could 可以用来
表示对过去， 现在和将来情况的推测和判断：
1. Must表肯定性较大的推测,意为“一定”,一般用于
肯定句中
2. May / might 则表示推测的语气不确定,用 may 表示
“ 也许,可能” might 语气比may 弱, 表示“或许,大概”
一般不用于疑问句中
3. Can / could 经常用在否定句或疑问句中,表示否定
的推测和判断. 有“不可能”之意. can’t 比couldn’t
语气强.------- Look, someone is coming. Who ______ it be ?
-------It _____ be our headmaster, I’m not sure.
------No, it ______ be him. He has gone to Shanghai.
------Oh, it _____ be Mr. Li. He is very alike our headmaster.canmaycan’tmust二. 情态动词表示对现在或将来情况的推测时,在
情态动词 后加动词的原形：
1. I have just called on him. He must study at home now.
2. He must be very busy because he has a lot of work to do
3. The boy is honest. He can’t lie.
4. There is no light in the room. She can’t be at home.5. ---- Are you going to Jeff’s party?
----- I’m not sure. I ______ go to the concert instead.
A. must B. would C. could D. might
6. I thought you______ like something to read, so I bought
you some books.
A. may B. might C. could D. must
DB三. 情态动词表示对过去情况的推测或判断时,在
情态动词后“ have + 过去分词”形式：
1. The road is wet. It must have rained last night.
2. He can’t have worked at the office last night, for he
had to go to a party at six in the afternoon.
3. They must have been too excited to sleep last night,
for they met with China’s first spaceman Yang Li wei.4. Tom worked here for two weeks . He may/ might
have known it.
5. The light is still on. They ____ to turn it off when they
left.
A. must forget B. must have forgotten
C. may forget D. could have forgottenB三. 情态动词表示对现在进行情况的推测时, 在
情态动词后加 “be + 现在分词” 形式：
1. The girl is not out. She must be doing her homework now.
2. It is twelve o’clock now. He must be having lunch now.
3. Mary can’t be playing the piano now. She went to the
shop with her mother a few minutes ago.Exercises:
1. --- Why ! I could n’t get you on the phone this morning.
----- We ____ tennis in the yard when you phoned.
A. must be playing B. could be playing
C. must have played D. must have been playingD2. ----- Why does Bob know so much about New Zealand?
------ He ______ , or……..
A. must have been there B. might visit it
C. may have been there D. can’t visit it
3. Jack ____ yet, otherwise he would have phone me.
A. must n’t have arrived B. should n’t have done
C. can’t have arrived D. need not have arrived
CC4. I _____ asleep . Because it took me a long time to realize
that the telephone was ringing.
A. could have fallen B. should have fallen
C. must have fallen D. must n’t have fallen
C5. I parked my car right here but now it’s gone. It_________.
A. must be stolen B. must have stolen
C. may be stolen D. must have been stolenD6.--- Is John coming by trains?
----- He should, but he_____ not. He likes driving his car.
A. must B. can C. need D. may 7. ---- Is there a flight to London this evening?
----- There____ be. I will phone the airport and find it out.
A. must B. would C. might D. canDC8. ----A man answered the phone, I supposed it was
her husband.
----- It ________ her husband. He has been dead for years.
A. must n’t be B. must n’t have been
C. could n’t be D. could n’t have been
DA9. --- Who____ it be that is knocking at the door?
------ It _________ be father, but I’m not sure.
A. can, may B. may, can
C. may, must D. need, should10. ---- What do you suppose happened to him?
-----I don’t know. He _________ lost.
A. might get B. can have got
C. may have got D. will get
CA11. You must be tired, _______?
A. are n’t you B. must n’t you
C. are you D. must you
12. You must have met her yesterday_________?
A. must n’t you B. did n’t you
C. haven’t you
BC13. You must have seen the new film______ ?
A. must n’t you
B. did n’t you
C. have n’t you
14. I’m sure there_______ be over 2 000 students in their
school.
A. must B. may C. might D. canA15. Peter________ come with us tonight, but he is n’t
very sure yet.
A. must B. may C. can D. willB16. My English– Chinese dictionary has disappeared.
Who __________ have taken it?
A. should B. must C. could D. wouldC17. ----- 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 n’t be D. must n’t beC