The parents were hanging greetings cards on the walls for 5

The parents were hanging greetings cards on the walls for 5 hours yesterday.
1. Were the parents hanging greetings cards on the walls for 5 hours yesterday?
2. Who was hanging greetings cards on the walls for 5 hours yesterday?
3. What were the parents doing for 5 hours yesterday?
4. What were the parents hanging on the walls for 5 hours yesterday?
5. Where were the parents hanging greetings cards for 5 hours yesterday?
6. When were the parents hanging greetings cards on the walls for 5 hours?
7. How many hours were the parents hanging greetings cards on the walls yesterday?
8. Were the parents hanging greetings cards on the walls for 5 or 6 hours yesterday?
9. Were the parents or children hanging greetings cards on the walls for 5 hours yesterday?
10. The parents were hanging greetings cards on the walls for 5 hours yesterday, werent they?