1 Ten years ago, this shopping centre wasn't here.
Ten years ago, this shopping centre didn't use to be here.
2 I thought he once lived in New York.
Didn't he use to live in New York?
3. When I was learning to play chess, I lost a lot of games.
I used to lose a lot of games when I was learning to play chess.
4 Originally, he wanted to be a professional footballer.
He used to want to be a professional footballer.
5 Wasn't she a waitress in the past?
Didn't she use to be a waitress?
6 He's only had a sports car since he became famous.
Before he became famous, he didn't use to have a sports car.