Used to употребляется для выражения привычки, присущей нам в прошлом.
5)- с. Мы используем Used to чтобы рассказать о чем-то, что мы делали регулярно в прошлом, но не делаем этого сейчас.
6) 1. We used to share all our problems.
2. We didn't go to the same school but we do now.
3. Did you use to go to the same shool as Emily?
7) 1. I used to live in the countryside when I was young.
2. I used to go for a lots of walks in the forest with my friends.
3. We didn't use to watch a lot of TV because we were always outside.
4. Did you use to walk to school in the morning?
5. My dad used to take me to school by car.
6. We used not to have school on Wednesday afternoon-those afternoon were free!