Used to:
1. I used to play football every week.
2. I used to do my homework at time.
3. He used to walk his dog twice a day.
4. She used to cut her hair every month.
5. They used to go to a party at the weekend.
Didn't used to:
1. I didn't used to play computer games.
2. I didn't used to watch films with my grandmother.
3. I didn't used to go for a walk in evening.
4. I didn't used to drink hot tea.
5. I didn't used to eat tomatoes.