could如果是表示“可能”用于一般过去时态时,回答可用could.
e.g.Could he play the piano two years ago?肯定回答：Yes,he could.否定回答：No,he couldn't.
如果表示“委婉”,回答用\"can\".
e.g.Could I use your computer?肯定回答可用：Yes,you can.但不能用Yes,you could.否定回答可用：Sorry,you can't.不用Sorry,you could't.我想你是问有关这吧
情态动词练习
1． May I stop my car here? No, you_____. A. can't B. mustn't C. needn't D. don't have to 2. Must we clean the house now? No, you _______. A. needn't B. may not C. mustn't D. can't 3. John _____ his father about his failure in the exam. A. dares not tell B. dares not telling C. dare not tell D. dares not to tell
4. You ________ return the book now. You can keep it next week if you like. A. can't B. mustn't C. needn't D. may not
5. Johnny, you _______ play with the knife, you _______ hurt yourself. A. won't...can't B. mustn't...may C. shouldn't, must D. can't...shouldn't 6. -Would you go out for a walk with me? -No, I ______ . My girl friend is coming. A. wouldn't B. shall not C. won't D. shouldn't
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could如果是表示“可能”用于一般过去时态时,回答可用could.
e.g.Could he play the piano two years ago?肯定回答：Yes,he could.否定回答：No,he couldn't.
如果表示“委婉”,回答用\"can\".
e.g.Could I use your computer?肯定回答可用：Yes,you can.但不能用Yes,you could.否定回答可用：Sorry,you can't.不用Sorry,you could't.我想你是问有关这吧
7. Man _____ die without water. A. will B. can C. need D. shall 8. If he started at 9 0'clock, he _______ be there by now. A. need B. shall C. ought to D. must
9. The teacher ______ do all the exercises, but a pupil_______.
A. needn't....must B. may not...must C. needn't....needn't D. can't....must 10. Would you open the window please ? Yes, I______. A. will B. would C. do D. can
12. -____Must I finish the homework this morning ? -No, you_____.
A. mustn't B. might not C. don't have to D. can't 13. You _______ the trees. Look, it is raining now. A. mustn't have watered B. needn't have watered C. could have watered D. might have watered 14. I ____ give you an answer tomorrow. I promise! A. must B. will C. may D. shall 15. ______ you be happy!
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could如果是表示“可能”用于一般过去时态时,回答可用could.
e.g.Could he play the piano two years ago?肯定回答：Yes,he could.否定回答：No,he couldn't.
如果表示“委婉”,回答用\"can\".
e.g.Could I use your computer?肯定回答可用：Yes,you can.但不能用Yes,you could.否定回答可用：Sorry,you can't.不用Sorry,you could't.我想你是问有关这吧
A. May B. Can C. Must D. Would 16. Must we come tomorrow?
A. No, you can't B. No, you needn't C. No, you mustn't D. No, you may not 17. ______ open the door for you ?
A. Would you like that I B. Do you want that I C. Will I D. Shall I 18. Please open the window,________? A. can't you B. aren't you C. do you D. will you 19. What _____ I do for you? A. should B. will C. must D. can
20. Could I borrow your dictionary? Yes, of course you______. A. might B. will C. can D. should
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