Ответ:
1. My mother cleans the apartment in the morning.
2. Grandpa watches TV from 6 o'clock.
3. They have been playing volleyball since they were 10 years old.
4. We have been studying English since 1998.
5. She writes this letter all day.
6. They do their homework all evening.
7. My friend has been talking about his vacation for an hour.
8. We discuss this topic from 3 o'clock.
9. My brother has been sleeping in his room since morning.
10. They run in the yard all day.