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情态动词 can, may, must, need, should, shall, will, could, would

情态动词 can, may, must, need, should, shall, will, could, would. The bird can sing sweet songs. Can I help you? May I leave the table now? No, you may not. Must I do my homework at once? No, you needn’t. You should apologize to Mr Hopkins. Shall we go by ourselves?

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情态动词 can, may, must, need, should, shall, will, could, would

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  1. 情态动词 can, may, must, need, should, shall, will, could, would • The bird can sing sweet songs. • Can I help you? • May I leave the table now? No, you may not. • Must I do my homework at once? No, you needn’t. • You should apologize to Mr Hopkins. • Shall we go by ourselves? • Could you help Linda with her lessons later?

  2. 情态动词的几种特殊用法： must 1. must +动词原形： 表示说话人对现有状态的主观猜测；意思是“一定是”注意此结构不用在否定句中。 Even the top students in our class can’t work out this problem, so it must be very difficult. Susan’s parents have bought a large house with a swimming pool. It must be very expensive.

  3. 2. 用must 开问的一般疑问句的肯定的回答只能是must; 但否定的回答有两种：一定不行的用mustn’t; 没有必要用needn’t. • A: Must I finish my homework before I play video games, Mum? • B: I’m afraid you must. • 2. A: Must I get up early tomorrow, Dad? • B: No, you needn’t. Tomorrow is Sunday.

  4. 3. 对用May 开问的一般疑问句的肯定回答通常用may; 但否定的回答也有两种；不可以的用 may not; 绝对不行的用mustn’t. • A: May I have some chocolates now? • B: Yes, you may. • 2. A: May I have some chocolates now? • B: No, you may not. • 3. A: May I play football now? • B: No, you mustn’t.

  5. can 1. Can 开问的句子，无论肯定还是否定，都用can 来回答。 A: Can I play football now? B: Yes, you can. No, you can’t. 2. 在征询对方许可的疑问句首， 可用can也可用may开问 A: Can I come in? / May I come in？ B: Yes, you can. / Yes, you may.

  6. 4. 用Could 开问的句子不表示过去时， 只表示语气的委婉，答句或后面的宾语从句都从现在时范畴的时态考虑。 1. A: Could you help me with my lessons? B: Of course I can. 2. Could you tell me if you have finished your work?

  7. would 情态动词 would 主要表示”愿意“， 其次作为will 的过去式使用。 • Would you like some tea? Yes, please. / No, thanks. • Would you like to join us? Yes, I’d like to. • Would you like me to help you with your English? • Yes, please. / That’s very kind of you. • No, thanks. / No, thank you. I can do it myself.

  8. 1.Because there is no light in the room, he _____ be in. A. mustn't B. can't C. needn't D. dare not 2.---May I smoke here? --- No, ________. A. you mustn't B. you may not C. you'd better not D. all the three answers 3.---Could I use your pen? --- Certainly, you ______. A. will B. can C. may D. could 4. --- Must we finish the work today? --- No, you ______. You may leave some to tomorrow. A. can't B. mustn't C. don't D. needn't 5. You _____ to the meeting this afternoon if you have something important to do. A. needn't to come B. don't need come C. don't need coming D. needn't come B A B D D

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