情态动词
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文档简介
(共18张PPT)
Grammar
must , can / could, may / might
Order:
Must Can Could May Might
certain uncertain
巧记must, can, may表推测的用法
can不肯，may 不问, must肯定不否问
can不肯，即can/could 一般不用于肯定句
may不问，即may/might一般不用于疑问句
must肯定不否问，即must 一般仅用于肯定句，不用否定句和疑问句
一、表示有把握的推测时，肯定句用must（一定，准是），否定句用can’t / couldn’t (不可能，一定不）。
must / can’t（couldn’t) +动词原形，表示对现在情况的推测。
走了这么长的路，你肯定累了。
You must be tired after a long walk.
他不可能饿了，因为他刚吃过午饭。
He can’t / couldn’t be hungry since he has just had lunch.
must / can’t (couldn’t) be doing 表示对现在正在进行的情况的推测
他们一定在等着我们，让我们快点走吧。
They must be waiting for us. Let’s hurry up.
他一直带着眼镜，所以他的视力不可能在好转。
He wears glasses all the time. So his eyesight can’t / couldn’t be getting better.
must / can’t (couldn’t) have done 表示对过去情况的推测
He must have tried his best.
他肯定已经尽力了。
他昨天不可能已经解决了问题。
He can’t / couldn’t have solved the problem yesterday.
二、表示把握不大的推测即可能性，用can / could和may / might, “也许，可能”，may/might 用于肯定句和否定句，can用于疑问句。May / might 用于疑问句时不表示推测，意为“可以…吗”
The news may / may not be true.
At this moment, he may / might be doing his homework.
The students may / might have seen the film before.
may / might (not)
+动词原形
+be doing
+have done
Where can he be
What can they be arguing for
Can she have lost the book
May I ask you a question
注：Can 表推测时用于肯定句时表示理论上的可能性。
Anything can happen.
Everybody can make mistakes.
may / might have done
can / could have done
needn’t have done
should / ought to have done
shouldn’t/ oughtn’t to have done
must have done
can’t have done
couldn’t have done
would have done
过去本来要做…却因某种原因没做
对过去事情的推测：
可能做过某事
本不必做某事
本来应该做某事
本来不该做某事
不可能做过某事
一定做过某事
本能够做某事
My sister met him at the 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 attened
A
2. 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
C
3. Sorry, I’m late. I______ have turned off the alarm clock and gone back to sleep again. A. must B. should C. can D. will
4. ---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
A
D
5. Michael ________be a policeman, for he is much too short.
A. needn’t B. can’t C. should D. may
6. ----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
B
D
7. There was plenty of time, she ____.
A. must not have hurried
B. needn’t have hurried
C. must not hurry
D. couldn’t have hurried
8. Where is my pen I ____ it. A. might lose B. would have lost C. should have lost D. must have lost
B
D
9. — Could I borrow your dictionary — Yes, of course you ______. A. might B. will C. can D. should
10. Peter _____come with us tonight, but he isn’t very sure yet.
A. must B. can C. may D. will
C
C
11. The temperature in our city ____ fall to 13°C freezing in winter.
A. shall B. can C. must D. should
12. With a little more care you _____ this traffic accident.
A. could have avoided
B. must have avoided
C. can’t have avoided
D. would be avoiding
B
A
Grammar
must , can / could, may / might
Order:
Must Can Could May Might
certain uncertain
巧记must, can, may表推测的用法
can不肯，may 不问, must肯定不否问
can不肯，即can/could 一般不用于肯定句
may不问，即may/might一般不用于疑问句
must肯定不否问，即must 一般仅用于肯定句，不用否定句和疑问句
一、表示有把握的推测时，肯定句用must（一定，准是），否定句用can’t / couldn’t (不可能，一定不）。
must / can’t（couldn’t) +动词原形，表示对现在情况的推测。
走了这么长的路，你肯定累了。
You must be tired after a long walk.
他不可能饿了，因为他刚吃过午饭。
He can’t / couldn’t be hungry since he has just had lunch.
must / can’t (couldn’t) be doing 表示对现在正在进行的情况的推测
他们一定在等着我们，让我们快点走吧。
They must be waiting for us. Let’s hurry up.
他一直带着眼镜，所以他的视力不可能在好转。
He wears glasses all the time. So his eyesight can’t / couldn’t be getting better.
must / can’t (couldn’t) have done 表示对过去情况的推测
He must have tried his best.
他肯定已经尽力了。
他昨天不可能已经解决了问题。
He can’t / couldn’t have solved the problem yesterday.
二、表示把握不大的推测即可能性，用can / could和may / might, “也许，可能”，may/might 用于肯定句和否定句，can用于疑问句。May / might 用于疑问句时不表示推测，意为“可以…吗”
The news may / may not be true.
At this moment, he may / might be doing his homework.
The students may / might have seen the film before.
may / might (not)
+动词原形
+be doing
+have done
Where can he be
What can they be arguing for
Can she have lost the book
May I ask you a question
注：Can 表推测时用于肯定句时表示理论上的可能性。
Anything can happen.
Everybody can make mistakes.
may / might have done
can / could have done
needn’t have done
should / ought to have done
shouldn’t/ oughtn’t to have done
must have done
can’t have done
couldn’t have done
would have done
过去本来要做…却因某种原因没做
对过去事情的推测：
可能做过某事
本不必做某事
本来应该做某事
本来不该做某事
不可能做过某事
一定做过某事
本能够做某事
My sister met him at the 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 attened
A
2. 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
C
3. Sorry, I’m late. I______ have turned off the alarm clock and gone back to sleep again. A. must B. should C. can D. will
4. ---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
A
D
5. Michael ________be a policeman, for he is much too short.
A. needn’t B. can’t C. should D. may
6. ----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
B
D
7. There was plenty of time, she ____.
A. must not have hurried
B. needn’t have hurried
C. must not hurry
D. couldn’t have hurried
8. Where is my pen I ____ it. A. might lose B. would have lost C. should have lost D. must have lost
B
D
9. — Could I borrow your dictionary — Yes, of course you ______. A. might B. will C. can D. should
10. Peter _____come with us tonight, but he isn’t very sure yet.
A. must B. can C. may D. will
C
C
11. The temperature in our city ____ fall to 13°C freezing in winter.
A. shall B. can C. must D. should
12. With a little more care you _____ this traffic accident.
A. could have avoided
B. must have avoided
C. can’t have avoided
D. would be avoiding
B
A