2. He used to be a very responsible person.
I don't know why he isn't a responsible person anymore.
3. They used to go always to art galleries.
I don't know why they don't go to art galleries anymore.
4. The price used to be low.
I don't know why the price isn't low anymore.
5. The costumers used to give very good tips.
I don't know why the costumers don't give good tips anymore.
6. He used to go for a walk every morning.
I don't know why he doesn't go for a walk anymore.
7. She used to study a lot.
I don't know why she doesn't study anymore.
8. He used to work for a multinacional company.
I don't know why he doesn't work for a multinacional company anymore.
9. They used to go out all the time.
I don't know why they don't go out anymore.
10. He used to play for the college team.
I don't know why he doesn't play for the college team anymore.

Se errei algo, sorry ^^