Unit 3 Looking good, feeling good
Grammar 2: Question tags
Step 1 Question tags
1. 定义
question tags反意疑问句: 又叫附加疑问句，是在一个陈述句后加上一个简短的疑问句，表示对陈述句所叙述的事实提出疑问或看法，询问对方是否同意。
It looks like rain, doesn't it ?
He doesn't need to work so late, does he ?
2. 构成
反意疑问句的基本结构有两种：
一是：肯定陈述句+简短的否定问句；二是：否定陈述句+简短的肯定问句。
简称“前肯后否，前否后肯。”
He is a teacher, isn't he ?
She didn't go to school, did she ?
3. 语调
