重点8 . 与used to 相关知识总结
1）used to do sth 过去常常做某事（现在已经不再如此）
例句：
There used to be an old temple here.
He used to be late when he was in Grade One.
He usedn’t [didn’t use] to come.
The river usedn't to be clean.
Did you use(d) to be a teacher? Yes, I used . No , I usedn’t
You used to go there, usedn’t /didn’t you?
There used to be a cinema here, use(d)n’t there?
Did people use to think that the earth was flat?
