情态动词
情感 态度
情态动词（助动词）
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1层含义 |
2层含义 |
否定 |
疑问 |
肯定、否定回答 |
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can |
can't |
Can.....? |
can can't | ||
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may |
can't |
May.....? |
can can't | ||
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must |
必须(自愿) has(have)to 不得不 don't have to |
一定 |
mustn't 不该 needn't don't need to |
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Sorry. I must go.
主语 谓语
1 陈述句 I can speak English.
2 否定句 I can not speak English.
3 疑问句 Can you speak English?
Yes, I can. No, I can't.
1 陈述句 You may use my dictionary.
2 否定句 You can not sit here.
may not
3 疑问句 May I come in?
Yes, you can. No, you can't.
1 陈述句 I must go now.
2 否定句 You mustn‘t speak up in the library.
3 疑问句 Must I learn English from Mr Pan?
Yes, you must. No, you needn't.
两层含义：
1 I can climb up this tall tree.（能够）
你能做什么？What can you do?
2 There is no light in the house. He can't be at home.（不可能）
英语不可能太难。English can't be difficult.
3 This ice-cream is nice. May I have another?（可以）
你可以好好休息。You may have a rest.
4 She isn't here. She may be in the garden.（也许）
我不知道我要去哪里。我也许会去澳大利亚。I don't know where I go. I may go to Australia.
5 I must remember many English words.（必须）
人人不许每日吃三餐。People must eat three meals a day.
6 He isn't at school today. He must be ill.（一定）
他们要结婚了。他们一定很快乐。They will marry. They must be happy.
用have to提问：
1 I have to go to hospital.
Do you have to go to hospital?
Why do you have to go to hospital?
I don't feel good.
2 Why do you have to get up early?
I have work to do.
3 Where does she have to go now?
She has to go to a restaurant to eat lunch.
4 How much does he have to pay?
5 How long do you have to wait for the bus?
6 Why do you have to phone your sister now?
7 What time does Paul have to leave?
don't have to不必 doesn't have to
1 I'm not working tomorrow, so I don't have to get up early.
2 The car park is free. You don't have to park your car there.
3 I am at the bank and there is no queue. So I don't have to wait.
4 Sally is very rich. She doesn't have to work.
5
6
7
needn't+v
1 We needn't leave yet.
2 I can go shopping alone. You needn't come with me.
3 We needn't walk all the way home.
4 You needn't ask first.
5 You needn't tell anyone else.
综合练习：
1 能够can
人人都能吃喝。（肯定）
没有水，鱼不能活。（否定）
人们能够互帮互爱吗？（疑问）
2 可以may 我可以有你的电话号码吗？（疑问）
3 必须must 中国人必须热爱和平。
4 一定must 你今年9月去美国。你一定很激动。
5 不得不have to/has to 学生们不得不每天完成他们的作业。
6 不必don't have to/doesn't have to 你不必等我。你先走。
7 不该musn't 你不该忘了睡前关灯。
8 不必needn't 你不必来医院看我。
9 不得不have to(疑问句) 你非要去办公室不可吗？
