情态动词
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用在第三人称陈述中，表规则规定的“必须”
4. You should be careful when doing your job. 应该, 表责任、义务、劝告或建议 5. We should arrive home before dark. 应该会，按理说，想必会，表预测
6. How should I know it? It’s strange that he should be absent from the meeting.
不必、不需要，表必要性
5. –I’ve prepared all kinds of food for the picnic. -- Do you mean we need not bring anything with us? 不需要，表必要性
should, ought to，shouldn’t, ought not to, shall 1. Shall he come in or wait outside?
4. Oil will float on water. 5. I still remember my happy childhood when my mother would take me to Disneyland at weekends.
表示客观上的习惯或倾向
6. This is the factory where my father used to work. He used not to be good at communicate with others. He didn’t use to be good at communicate with others. Used he to be good at …? Did he use to be good at …?
用在第一或第三人称疑问句中，表征求意见或指示
2. You shall remain in your seats until all papers have been collected.
用在第二或第三人称陈述中，表命令、警告、许诺
3. It has been accepted that all the students shall put on masks before going to school In case they are infected with flu virus.
3. We have to protect the environment for ourselves and our future 不得不，表必要性 Yes, I must. / No, I don’t have to./ No, I needn’t.
竟会，到底，表示 意外、惊讶、纳闷等 感情色彩
must, may, might, may not, might not, could, can, couldn’t, can’t 1. You must be tired after the long journey. 一定，想必，表肯定推测 2. --What are you doing this Saturday? -- I’m not sure, but I may / might go to the Rolling Stones concert. 也许，可能，表可能性推测 3. He might not / may not come to the party, for he is busy. 也许不，可能不，表否定推测
情态动词+have done
1. Tom may have passed the driving test, but I am not sure about it. 2. He is upset. He must have been punished. 3. There is nowhere to find them. Where can they have gone? 4. You can’t have seen her in her office last Friday; she’s been out of town for two weeks.
must, mustn’t, have to, don’t have to, need to, don’t need to , needn’t do
1. You must be careful with the camera. It costs.
必须，一定，表必要性 2. Students mustn’t smoke. 必须不，表禁止
• 5. Considering his ability, he could have • done it better. • 6. He might have given you more help, even though he was busy. • 7. You should have told me earlier. • I’m sorry. I shouldn’t have been so rude to you. • 8. He needn’t have gone to the station yesterday.
can、could、be able to
1. Although he is only four, he can/is able to play the piano. 能够，表能力 2. He could speak four foreign languages when he was ten years old. 能够，表能力 3. He was able to get out of the room when the fire broke out. 能够，表过去具体某次成功做了某事 能，表征求许可 4. Can I use your computer for a while? 5. Could I borrow your bicycle? 能，表征求许可 6. Anyone can be in a rough life time, whether he is “Bai Fumei” or “Gao Fushuai”. 会，表一时的情况
4. Can he be at home now? 表可疑推测，可能。。。吗？
5. It can’t be true. 不可能，表否定推测，语气坚决
• 7. May I use your computer? • -- Yes, you may. / No, you mustn’t. 可以，表请求许可 • • 8. May you succeed!
情态动词
1. can、could、be able to 2. must, mustn’t, have to, don’t have to, need to, don’t need to , needn’t do 3. should, shall 4. must, may, might, may not, might not, could, couldn’t, can’t 5. dare, don’t dare to do, dare not 6. will, would, used to do, didn’t use to do, used not to do
祝愿
dare, don’t dare to do, dare not
• 1. She dare not go out alone at night. • 2. She doesn’t dare to go out alone at night. • 3. Does she dare to go out alone at night? • 4. Dare she go out alone at night? • No, she daren’t.
will, would, used to do, didn’t use to do, used not to do 1. Will you help me with the luggage? Would you pay me in cash, please?\ 用在第二人称作主语的疑问句表示请求
2. They asked if we would do that again. It you will help him, things will become better. 表示意志、意愿、决心、愿望 3. The door would not open, no matter how hard she pushed. 表示意志、意愿、决心、愿望
4. You should be careful when doing your job. 应该, 表责任、义务、劝告或建议 5. We should arrive home before dark. 应该会，按理说，想必会，表预测
6. How should I know it? It’s strange that he should be absent from the meeting.
不必、不需要，表必要性
5. –I’ve prepared all kinds of food for the picnic. -- Do you mean we need not bring anything with us? 不需要，表必要性
should, ought to，shouldn’t, ought not to, shall 1. Shall he come in or wait outside?
4. Oil will float on water. 5. I still remember my happy childhood when my mother would take me to Disneyland at weekends.
表示客观上的习惯或倾向
6. This is the factory where my father used to work. He used not to be good at communicate with others. He didn’t use to be good at communicate with others. Used he to be good at …? Did he use to be good at …?
用在第一或第三人称疑问句中，表征求意见或指示
2. You shall remain in your seats until all papers have been collected.
用在第二或第三人称陈述中，表命令、警告、许诺
3. It has been accepted that all the students shall put on masks before going to school In case they are infected with flu virus.
3. We have to protect the environment for ourselves and our future 不得不，表必要性 Yes, I must. / No, I don’t have to./ No, I needn’t.
竟会，到底，表示 意外、惊讶、纳闷等 感情色彩
must, may, might, may not, might not, could, can, couldn’t, can’t 1. You must be tired after the long journey. 一定，想必，表肯定推测 2. --What are you doing this Saturday? -- I’m not sure, but I may / might go to the Rolling Stones concert. 也许，可能，表可能性推测 3. He might not / may not come to the party, for he is busy. 也许不，可能不，表否定推测
情态动词+have done
1. Tom may have passed the driving test, but I am not sure about it. 2. He is upset. He must have been punished. 3. There is nowhere to find them. Where can they have gone? 4. You can’t have seen her in her office last Friday; she’s been out of town for two weeks.
must, mustn’t, have to, don’t have to, need to, don’t need to , needn’t do
1. You must be careful with the camera. It costs.
必须，一定，表必要性 2. Students mustn’t smoke. 必须不，表禁止
• 5. Considering his ability, he could have • done it better. • 6. He might have given you more help, even though he was busy. • 7. You should have told me earlier. • I’m sorry. I shouldn’t have been so rude to you. • 8. He needn’t have gone to the station yesterday.
can、could、be able to
1. Although he is only four, he can/is able to play the piano. 能够，表能力 2. He could speak four foreign languages when he was ten years old. 能够，表能力 3. He was able to get out of the room when the fire broke out. 能够，表过去具体某次成功做了某事 能，表征求许可 4. Can I use your computer for a while? 5. Could I borrow your bicycle? 能，表征求许可 6. Anyone can be in a rough life time, whether he is “Bai Fumei” or “Gao Fushuai”. 会，表一时的情况
4. Can he be at home now? 表可疑推测，可能。。。吗？
5. It can’t be true. 不可能，表否定推测，语气坚决
• 7. May I use your computer? • -- Yes, you may. / No, you mustn’t. 可以，表请求许可 • • 8. May you succeed!
情态动词
1. can、could、be able to 2. must, mustn’t, have to, don’t have to, need to, don’t need to , needn’t do 3. should, shall 4. must, may, might, may not, might not, could, couldn’t, can’t 5. dare, don’t dare to do, dare not 6. will, would, used to do, didn’t use to do, used not to do
祝愿
dare, don’t dare to do, dare not
• 1. She dare not go out alone at night. • 2. She doesn’t dare to go out alone at night. • 3. Does she dare to go out alone at night? • 4. Dare she go out alone at night? • No, she daren’t.
will, would, used to do, didn’t use to do, used not to do 1. Will you help me with the luggage? Would you pay me in cash, please?\ 用在第二人称作主语的疑问句表示请求
2. They asked if we would do that again. It you will help him, things will become better. 表示意志、意愿、决心、愿望 3. The door would not open, no matter how hard she pushed. 表示意志、意愿、决心、愿望