The key answer of exercise 2

a)

1. Did you use to be
2. didn't use to work
3. used to wear
4. Did you use to have
5. didn't use to study
6. used to be
7. didn't use to play
8. Did your teachers use to give

b)

1. I used to sit at the back of the class.
2. Jon used to go to school on Saturday mornings.
3. We didn't use to understand our German teacher.
4. Did you use to go to school by bus?
5. School used to start at 9.00 but now it starts at 8.30.
6. Did your friends use to help you with your homework?

c)

1. What school did you use to go to?
2. What subject did you use to like the most?
3. What subjects did you use to hate?
4. Which teacher did you use to like most?
5. Did you use to work hard?
6. What sports did you use to do?
7. What did you use to do after school?