Ex1:
1. used to

2. used to

3. use to

4. use to

5. used to

6. to walk

7. use to

8. used to

9. be

10. use to

11. use to

12. used to travel

13. used to

14. use to like

15. use to

Ex2:
1. Susan didn't use to live in Paris.

Did Susan use to live in Paris ?

2. They used to commute from New York to London.

Did they use to commuate from New York to London ?

3. Your mother used to teach at the local school.

Your mother didn't use to teach at the local school.

4. He used to cry a lot.

Did he use to cry a lot ?

5. My brother didn't use to go swimming when he was young.

Did my brother use to go swimming when he was young ?

=>
1/
1. used to
2. used to
3. use to
4. use to
5. used to
6. to walk
7. use to
8. used to be
9. be
10. use to
11. use to
12. used to travel
13. used to
14. use to like
15. use to

2/
1. (-) Susan didn't use to live in Paris.
(?) Did Susan use to live in Paris?
2. (+) They used to commute from New York to London.
(?) Did they use to commute from New York to London?
3. (+) Your mother used to teach at the local school.
(-) Your mother didn't use to teach at the local school.
4. (+) He used to cry a lot.
(?) Did he use to cry a lot?
5. (-) My brother didn't use to go swimming when he was young.
(?) Did your brother use to go to swimming when he was young?