1. They used to live abroad...
2. She used to be a student...
3. She didn't use to eat meat...
4. I used to like cats...
5. I used to enjoy tv...
6. We used to spend a lot of time together...
7. He didn't use to speak a foreign language...
8. My grandad didn't use to have a lot money...
(Patrzysz na drugą część zdania i po tym stwierdzasz, czy dać used to, czy didn't use to) :)