used to
固定词组
used to意为“过去常常”, 暗指现在已经不存在的动作或状态, 后接动词原形。
1. 否定句
used to的否定式通常为didn’t use to。如:
She didn’t use to have long hair.
2. 一般疑问句
含有used to的句子变为一般疑问句时, 可用“
助动词Did+主语+use to do sth. ?”结构。肯定回答用Yes, sb. did;否定回答用No, sb. didn’t。如:
—Did you use to play the piano? —Yes, I did. /No, I didn’t.
3. 特殊疑问句
含有used to的特殊疑问句的结构为“疑问词+助动词did+主语+use to do...?”。如:
—What did you use to do? —I used to collect stamps.
4. 反意疑问句
如果陈述部分含有used to, 附加疑问部分通常使用助动词did来引导。如:
The house used to be a shop, didn’t it?