情态动词课件 黄淑萍

4)表示“许可”，可与may 换用。 7）You can go home now. 5) 用于疑问句或否定句中时，表惊异、 不相信等，意思是“可能、能够”。 8）How can you say that you really understand the whole story if you have covered only part of the article?
I haven’t been able to see the film.
3）表示特定的某一过去能力或表示 成功地做了某事时，只能用 was/were able to， 不能用could。
He was able to escape from Europe before the war broke out.
3. may 与might
1) 表示“许可”或“请求”，有“可以”的意思，口语中 常用 might 代 may ,表示委婉语气。 否定回答时用“must not”表“禁止，阻止”， 不用 “may not”. “may not” 表示“可能不” 。
1) May I watch TV after supper? Yes, you may. / No, you mustn’t.
5. Should 与 ought to
2. must着重说明主观看法，have to 强 调客观需要。另外，have to 能用于更 多时态。 I don’t like this TV set. We must buy a new one. There was no more bus. They had to walk home.
2. can 与could
3.He must have gone to Beijing, hasn’t he?
注意：must 和 have to
1.must用于一般问句中,肯定回答用must 否定式用 needn’t或don’t have to， 做 “不必”,mustn’t表示“禁止，不允许” e.g.Must I finish all assignments at a time? Yes, you must. No, you needn't. /don’t have to.
固定词组
1) can’t help doing/to do/do 情不自禁做什么/ 不能帮忙做什么 I’m so tired that I can’t help finish the project. He can’t help bursting out laughing .
2) can’t too adj/adv can’t adj/adv enough 再怎样都不过分
the south, isn’t, he?
2.Tom bought a lot of apples. He must like eating apples, doesn’t he?
3.It is eleven o’clock at night and the lights are off. They must be sleeping now,
1.Sorry I'm late. I _____ A have turned off the alarm clock and gone back to sleep again. A. might B. should C. can D. will B come with us tonight, 2.Peter _____ but he isn’t very sure yet. A. must B. may C. can D. will
3) 表示对具体事情的推测，意思是“一定， 肯定”语气 较强，只用于肯定句中。
1)He must come from American. 2)He must be sleeping at the moment. 3)He must have stayed up last night.
1.Judging from his accent, he must be from
He was able to swim before he got tired.
注意 2. can/could have done
Can’t/couldn’t have done
对过去发生行为的可能性进行推测: I saw him just now so he couldn’t have gone abroad.
4) 表示功能，译作“能、行” 8) That will be all right. 9) This door won’t open.
注意：used to 与would
would表过去反复发生的动作或某种倾向 “总是,总要” used to表过去常常（现在已没有这种习惯） “过去常常” used to 可于状态动词连用 would不可以 He used to be a quiet boy. (√ ) He would be a quiet boy. ( × )
2) 表示可能性。 意为“或许，可能” might 比 may 可能性小。 2) It might be true. 3) They may be in the library now.
3) may/ might as well + 动词原形 “…还是…的好” may/might well +动词原形“完全可能” 4) Now that it is raining heavily, you might as well stay at home. 5)He may well be proud of his son. 4) May you +动词原形 表“希望、祝愿、祈求” “祝你……”
We could have faced the difficulty together,but why didn’t you tell me?
B be a policeman, for he’s much too short. 1. Michael ____ A. needn’t B. can’t C. should D. may A it be 2. Mr. Bush is on time for everything. How ____ that he was late for the opening ceremony? A. can B. should C. may D. must 3. ---- I stayed at a hotel while in New York. ---- Oh, did you? You ____ A with Barbara. A. could have stayed B. could stay C. would stay D. must have stayed 4. My sister met him at the Grand Theater yesterday A your lecture. afternoon, so he ____ A. couldn’t have attended B. needn’t have attended C. mustn’t have attended D. shouldn’t have attended
aren’t they?
1.We must have learned 2,000 words by the end of last term, hadn’t we?
2.It must have rained last night, for the road was very muddy， didn’t it?
6)ave done
mightn’t/mayn’t have done 表示对过去发生的动作进行可能性推测。 He may not have gone to the clinic. He might have read about the news in the newspaper.
高中英语公开课
庐江二中 黄淑萍 2013.10
情态动词有一定的意义， 但没有人称和数的变化，不 能独立使用，它和后面的动
词构成谓语．
1. must
1) 表示义务或强烈的劝告，意为“必 须”“应该”， 其否定式表示“不应该”“不许可” “不 准”“禁止”。 1) You must finish your homework first. 2) Children mustn’t speak like that to their parents. 2) 表示“非要，偏要，”表达说话者的不满， 3)Why must you be talking so loudly when others are sleeping?
1.Days later,my brother called to say he C was all right,but______say where he was. A.must’t B.should’t C.would’t D.might’t
B 2.He____not pay unless he is punished to pay. A.shall B.will C.can D.would
1)表能力 1) Some of us can use the computer now, but we couldn’t last year. 2) The new-built theatre can seat 1500 people. 2)表示推测，意为“可能”“或许”，用于疑问句或否定句 表示不可能 3) Can she be in the computer center? 4) I though what he said could not be true. 3)表示“请求” “允许”(表请求时，口语中常用 could 代替 can 使语气更委婉，回答时用can) 5) Can/Could I use your dictionary? 6) Could you lend me a hand?