在英语越来越普及的21世纪，学好英语成了每个大学生的首要目标。为帮助大学生更好地学习英语知识，特提供以下文章：
Tag Questions 反意疑问句
Detailed Points
首先判断是助动词还是情态动词
1. Have to
反意疑问句的陈述部分谓语有have to时，附加疑问句通常用助动词do。
You have to study hard, don't you?
I don't have to get up early, do I?
They had to obey the rules and regulations of the school, didn't they?
She didn't have to do it herself, did she?
2. Need
反意疑问句的陈述部分谓语有need时，need做情态动词，附加疑问句仍用need，need做实义动词时，附加问句用助动词do。
They needn't make such a loud noise, need they?
He needs the money for his son's education, doesn't he?
3. Had better
反意疑问句的陈述部分为had better时，附加问用助动词had。
You had better go at once, hadn't you?
We'd better call off our appointment, hadn't we?
4. Would rather
反意疑问句的陈述部分为would rather时，附加问句用情态动词would。
You'd rather not do it, would you?
She would rather die than surrender to the enemy, wouldn't she?
5. Used to
反意疑问句的陈述部分为used to时，附加问句用助动词did。
You used to stay up late every evening watching TV, didn't you?
6. Ought to
反意疑问句的陈述部分为ought to时，附加问句用助动词should.
She ought to go by plane, shouldn't she?
We ought not to laugh at others'mistakes, should we?
7. Must
反意疑问句的陈述部分有must，附加问句分三种情况：
⑴must do—mustn't
⑵must be—随人称用系动词一般现在时
⑶must have done—didn't
①We must book the ticket in advance, mustn't we? (必须)
②She must be in the office, isn't she? (肯定)对现在事情的肯定猜测。
③He must have done his homework, didn't he? (肯定)对过去事情的肯定猜测。
8. Wish
反意疑问句的陈述部分是wish时，附加问句用情态动词may。
I wish to shake hands with you, may I?
人称和数
1. 陈述部分主语是"I"时，附加问句的人称分二种情况：
⑴I hope that…, don't you?
I can't believe it, can you?
⑵I will be 14 tomorrow, aren't I?
I am interested in it, aren't I?
2.
陈述部分主语是everything、nothing、something等时看作单数，附加问句用it指代。
陈述部分主语是everyone、everybody、nobody、somebody、someone、no one 、anybody、any one等时看作复数，附加问句用they指代。
陈述部分主语是不定代词one时，附加问句用one指代。