否定句：He didn't used to go to school late.Lucy didn't used to go to bed late.We didn't used to have long hair.
一般疑问句：Did he used to go to school late?Did Lucy used to go to bed late?Did we used to have long hair?
反意疑问句：He used to go to school late,didn't he?Lucy used to go to bed late,didn't she?
We used to have long hair,didn't we?