情态动词

1.表示可能性：表示推测, 意为“可能”“或许”

2.表示请求或许可：

3.其他情态动词的用法

A．c an/could

表能力, 意为“能够，可以”;e.g The newly-built theatre can seat 1500 people.

表示许可, 意为“可以”可与may 换用。e.g You can go home now.

B．s hould

用于表义务、劝告、建议。意为“应该、应当”; As a student, you should be at school on time.

C. must

表示义务或强烈的劝告，意为“必须”“应该”，其否定式mustn’t 表示“不许可”“不准”注意：回答must 所在的一般疑问句时，否定回答用“needn’t” “don’t have to”意为“不必要”.

e.g Children mustn’t speak like that to their parents.

---Must we finish the work tomorrow? --- No, you needn’t.

语法专练---用适当的情态动词填空。

1.I am very sleepy. I ________ have stayed up so late.

2.Shall I leave the room so that you two can talk? ---No, you ________.

3.He ________ have missed the plane; the traffic was not so heavy.

4.She hasn’t slept for three days. She really ________ have a rest.

5.My father ________ return to Beijing from New York tomorrow, but isn’t sure

yet.

6.________ you help me? I don’t know how to use this computer.

7.________ Charlie come in? He has been waiting for almost an hour.

8.According to the new law, you ________ visit your parents every now and then.

9.His bike isn’t here now. He ________ have gone home.

10.Could I borrow your bike? --- Yes. Of course you ________.

翻译句子：

1.这种下雨的天气可能会发生事故。____________________________________.

2.他说的可能是真的吗？_____________________________________.

3.我现在必须完成这项工做吗？_________________________________________.

4.动物是我们的好朋友，我们应该保护他们不受伤害。

__________________________________________________________.

B语法---情态动词Model Verb (ought to/ have to/ must)

B．情态动词的重点——情态动词+have done

1.表示对过去事情的推测或估计

a.must have done “想必或肯定已经做了某事”

b.may/might have done “可能/大概已经做了某事”

c.can’t/co uldn’t have done“不可能已经做了某事”

2.情态动词表虚拟的用法，表示对过去所发生事情的遗憾或责备

a.should/ ought to have done“过去本应该做而没做”

b.shouldn’t/oughtn’t have done“过去不该做的事却做了”

c.could have done“本来能够做的是却没做”

d. needn’t have come done 表示不必做的事情却做了

语法专练---用适当的情态动词填空。

1. I was really anxious about you. You ______ have left home without a word.

2. Mr. White ______ have arrived at 8:30 for the meeting, but he didn’t show up.

3. -- Tom graduated from college at a very young age.

-- Oh, he ____ have been a very smart boy then.

4. What a pity. Considering his ability and experience, he ______ have done better.

5. He _____________ (finish) the job yesterday, for he was badly ill.

6.The plane left. You ____________ (come) the airport earlier.

7. It ______________ (rain) last night, for the road was wet.

8.He ____________ (admit) to the college, but he failed.

9.I’m not feeling well. I __________ (eat) so much fried chicken just now.

10. You should have informed me that the meeting was canceled. I ________ (run)

all the way here through the heavy rain.

句子翻译：

1.____________________________________(没有医生允许，他本不应该工作）Now, he has to stay in bed for a couple of days.

2. ____________________.(我们本不需要预定它)Look, this restaurant is almost empty.

3. _____________________.(他的头发不可能已经剪了) Because his hair is still long.

4.他肯定已经通过了这次考试因为他面带笑容地看着试卷。

__________________________________________________________

5. 就因为你粗心。事实上，你本能够赢。

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