Ex. 1

a) I used to go

b) I didn't use to

c) I didn't use to read

d) I used to be

e) Children used to wear

f) I used to dislike

g) Children used to be

h) I used to look

Ex.2a

1. didn't use to have

2. used to be

3. used to be

4. didn't use to be

5. used to have

6. didn't use to have

7. used to be

8. used to believe

Ex. 2b

1. +

2. +

3. I didn't use to be quiet and shy around new people.

4. +

5. I didn't use to have a bossy friend.

6. +

7. +

8. I didn't use to believe everything I read on the Internet.