反意疑问句是英语中常用的一种语法结构，通常用于向对方表示确认或否定。它由一个主句和一个疑问句构成，疑问句一般是由助动词或情态动词加上主语和动词构成的。反意疑问句的回答通常是简短的肯定或否定回答。

反意疑问句的用法有以下几点：

1. 反意疑问句通常用于询问对方是否同意或确认所说的话。例如：

- You like pizza, don't you?

- He's coming to the party, isn't he?

2. 反意疑问句也可用于表示反问或疑惑。例如：

- You haven't seen the movie yet, have you?

- She didn't tell you the news, did she?

3. 反意疑问句还可用于表示命令或请求。例如：

- You'll help me with the dishes, won't you?

- You won't tell anyone, will you?

在回答反意疑问句时，通常要注意以下几点：

1. 如果主句是肯定的，疑问句就用否定形式。例如：

- You're not coming with us, are you? (回答：No, I'm not.)

- You don't like coffee, do you? (回答：No, I don't.)

2. 如果主句是否定的，疑问句就用肯定形式。例如：

- You haven't seen the movie, have you? (回答：Yes, I have.)

- You don't mind if I sit here, do you? (回答：No, I don't.)

3. 如果主句中含有情态动词，疑问句中的助动词要与之对应。例如：

- You can speak French, can't you? (回答：Yes, I can.)

- You won't be late, will you? (回答：No, I won't.)

总之，反意疑问句是英语中常用的一种语法结构，通常用于确认或否定。回答时要根据主句的肯定或否定来选择相应的回答方式，同时还要注意主句中是否含有情态动词。