| 问句 | 肯定回答 | 否定回答 |
| Need you…? | Yes, I must. | No, I needn't |
| Must you…? | No, I don't have to. |
典型例题
1）——Could I borrow your dictionary？
——Yes， of course， you____.
A. might B. will C. can D. should
答案C. could表示委婉的语气，并不为时态。答语中of course，表示肯定的语气，允许某人做某事时，用can和 may来表达，不能用could或might.will 与you连用，用来提出要求或下命令。should与you 连用，用来提出劝告。
2）——Shall I tell John about it？
——No， you ___. I've told him already.
A. needn't B. wouldn't C. mustn't D. shouldn't
答案A.needn't 不必，不用。 wouldn't 将不， 不会的。 mustn't 禁止、不能。 shouldn't 不应该。本题为不需要，不必的意思，应用needn't.
3）——Don't forget to come to my birthday party tomorrow.
——______.
A. I don't B. I won't C. I can't D. I haven't
答案B. will既可当作情态动词，表请求、建议、也可作为实义动词表"意愿、意志、决心"，本题表示决心，选B.
