Помогите отредактировать предложения
Introduce help-verbs and correction whenever necessary:
1. Who (works) in your library?
2. What method you (used) in your previous experiment?
3. What (helps) you in your work?
4. When she (will call) you?
5. Why you (didn't come) on time?
6. How much money she (has) on her account?
7. Whose dictionary (lies) on the table?
8. Why you (don't return) books on the library?