Ответы:
1. She had to treat her immune system some years ago.
2. People didn't have to buy tablets or iPads in the 80s.
3. Jenny had to throw a great party yesterday because of her birthday.
4. What did you have to do in that situation?
5. I could be very patient at the dentist’s when a kid.
6. It started to rain and we had to return.
7. She had to go to hospital last year.
8. They did not have to work yesterday.
9. My granny could not find the album with old photos.
10. Mike had to buy medicine to cure his stomachache yesterday.