10）Where can Mary have gone?
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can/be able to
can表示“能够”时与短语be able to同义， 但can只用于一般现在时或过去时，而后 者可用于各种时态。另外，can表示个人 有某种能力，而be able to表示某人通过努 力、克服困难做成某事，相当于succeed in doing sth.；
C. mustn’t have attended D. shouldn’t have attended
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5. There’s someone outside. Who __A__it be?
A. can B. need
C. may D. must
6. ----Is Jack on duty today?
tomorrow afternoon. ---- They __B___ be ready by 12:00
A. can B. should
C. might D. need
c 3. We ______ last night, but we went to the concert instead.
A. must have studied B. might study
6) How can you believe such a liar like him?
5. can’t/ couldn’t have done 表示对过去情况的否定推 测,意为“过去不可能做过某事”
7) Susan can’t have written a report like this. 8) She can’t have gone to school, it is Sunday .
A. can B. need
C. dare D. must
8. The fire spread through the hotel very quickly, but everyone ___C____ get away.
A. were able to B. would
C. was able to D. could
却干了
Eg: You should have invited me to the party yesterday. You are right. I Should have thought of that. You shouldn’t have eaten all the cakes in one day.
deep in thought. 4) We would sit around Grandpa after supper, listening to his stories.
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1. If you __B__ wait here for another 5 minutes, our manager
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
1.表能力,意为“能，能够”，can指现在，could指过去。
1) Some of us can use the computer now, but we couldn’t last year.
2. 表示推测，意为“可能”“或许”，用于疑问句 或否定句，can’t和couldn’t意为“不可能”。
2) Can she be in the computer center? 3) I though what he said could not be true.
but he isn’t very sure yet.
A. must
B. may
C. can
D. will
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3. will 与would
1. 用于第二人称的疑问句中，表“请求、建议”等，用 would 比用will 委婉，客气些
Eg: 1)Will you lend me your book? 2) Would you like a cup of tea?
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3.表示习惯性动作。 译作 “总是、惯于”， will 指现在 常常，would 指过去常常。
Eg: 1)This man is strange. He will sit for hours without saying anything.
2) Mary will keep asking some silly questions. 3) Every evening, she would sit by window,
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2. 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” 。
Eg: 1)--- May I watch TV after supper? --- Yes, you may. / No, you mustn’t. 2) Today is Sunday. She may not in her office now.
2. 表示可能性。 意为“或许，可能” might 比 may 可能性小。
Eg: 1) The girl might be sleeping this time of day. 2) They may be in the library now.
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3.may/might have done 表示对过去发生过的事情的推测， 意为“可能已经做过某事”
C. would stay
D. must have stayed
4. My sister met him at the Grand Theater yesterday
afternoon, so he __A__ your lecture.
A. couldn’t have attended B. needn’t have attended
2. 用于表示意志或意愿，意为“会，愿意” 。will 指现在，而 would 指 过去。用于否定句中，表示 “不会、不肯、不乐意”。
Eg: 1) I won’t do that again. 2) They said that they would help us. 3) No matter what I said, he won’t listen to me.
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情态动词的语法特征
1）情态动词表说话人的某种感情或语气，对 某一动作或状态的某种态度。
2) 情态动词不能单独做谓语, 后面只能接动词
原形，ght to和have to除外，。
3) 情态动词没有人称, 数的变化, 但有些情态 动词, 如can、will、have to、may等有过去式。
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1. can 与could
----It _C___ be him. It’s his turn tomorrow.
A. mustn’t B. won’t
C. can’t D. needn’t
7. It is usually warm in my hometown, but it _A___be rather
cold sometimes.
Eg: I can’t find my sunglasses. I may/might have left them in your office.
4. may/ might as well + 动词原形 “…还是…的好” “不妨干某事” Eg: You may as well go and have a look.
will come back.
A. should B. will
C. need D. must
2. When he was there, he__A____ go to that coffee shop at the
corner after work every day.
A. would B. should C. had better D. might
2. 两者都可表示推测，表示很大的可能性。意为 “可 能、按理该…”
Eg: 1) It’s 7 o’clock, he should be at home.
2) They should have arrived by now.
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3. ought to/should have done 本应该干某事可事实未干 oughtn’t to/shouldn’t have done本不该干某事可事实
4. Should可以用来表示说话人的惊奇等情感，意为 “竟然，居然”
Eg: 1) It’s surprising that Mary should love such a person. 2) It’s unbelievable that the boy should sing such a
beautiful song. 15
1.You can’t imagine that a well-behaved gentleman __B___
be so rude to a lady.
A. can B. should
C. may D. must
2. ---- When can I come for the photos? I need them
C. ought to have studied D. would study
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5. shall
1. Shall用于第一、三人称的疑问句中，表示说话人征 求对方的意见或请求。