文档介绍：九年级第四单元知识点总结
used to do sth. 过去常常做某事
(used to be…过去常常是某种状态)
否定： didn’t use to do sth.
一般疑问：Did sb. use to do sth.? Yes, …did./ No, …didn’t.
特殊疑问：特殊疑问词+did sb. use to do sth.?
例：I used to be afraid of the dark.
I didn’t use to be afraid of the dark.
----Did you use to be afraid of the dark?
----Yes, I did./ No, I didn’t.
----What did you use to be afraid of?
----I used to be afraid of the dark.
be used to doing sth. 习惯于做某事
be afraid of sth./doing sth. 害怕某物/事
be afraid to do sth. 害怕做某事
Talk about what you used to be like（介词）讨论你过去的样子
----Mario, you used to be short, didn’t you?
---- Yes, I did.
反意疑问句：反意疑问句是由陈述句和附在其后的附加疑问句组成。其中附加疑问句是对陈述句所说的事实或观点提出疑问，起证实作用，一般用于证实说话者所说的事实或观点。
（1）结构：前肯定后否定，前否定后肯定；回答时根据事实来回答，即：事实上是就用Yes,事实上不是就用No。注意：Yes后跟肯定，如Yes, he ，如No, he didn’t.
A. ----You are a middle school student, aren’t you? (be 动词)
----Yes, I am./No, I’m not.
（2）构成：句子+逗号+助动词/be 动词/情态动词的肯定或否定形式 + 主语+问号
（3）当前面句子中包含有表示否定含义的词，如no, never, seldom, hardly, little, few, nothing, nobody等时，其后反意疑问句用肯定形式，而不加not！
There are no students in the classroom, are there?
He has few friends, does he?
You father has never been to Beijing, has he?
for the first time 首次
What did his friends use to look like?
What did his friends use to be like?
wear glasses 戴眼镜 long curly hair 长卷发 blonde hair 金发
I haven’t seen you for four years! 我已经