Задайте все возможные вопросы к данному предложению "Classes begin at eight"

Classes begin at eight.

1. Do classes begin at eight?

2. What time do classes begin?

3. When do classes begin?

4. What begins at eight?

5. Do classes begin at eight or nine?

6. Do classes begin or finish at eight?

7. Do classes or breaks begin at eight?

8. Classes begin at eight, don't they?