Answer:
1. How many email did he send before his computer broke?
2. When did you start playing basketball?
3. How long did you live there before you moved?
4. When did the children do their exercises?
5. Why was your grandfather tired?
6. How long has the doctor been writing prescriptions?
7. How many stories had George written for the school magazine?
8. How long did she know mark before she married him?