問句 肯定回答否定回答
need you…?yes, i must. no,i needn't
must you…? /don't have to.
典型例題
1）---could i borrow your dictionary?
---yes, of course, you____.
a. might b. will c. can d. should
答案c.could表示委婉的語氣，並不為時態。答語中of course，表示肯定的語氣，允許某人做某事時，用can和 may來表達，不能用could或might。複習： will 與you連用，用來提出要求或下命令。should與you 連用，用來提出勸告。
2）---shall i tell john about it?
---no, you ___. i've told him already.
a. needn'tb. wouldn'tc. mustn'td. shouldn't
答案a。needn't 不必，不用。 wouldn't 將不, 不會的。 mustn't 禁止、不能。 shouldn't 不應該。本題為不需要，不必的意思，套用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既可當作情態動詞，表請求、建議、也可作為實義動詞表"意願、意志、決心"，本題表示決心，選b。