Нужна помочь по английскому языку. Помогите пожалуйста перевести предложения в косвенную речь.

15. My mother asked me if I had cleaned that room that day
16. Her teacher told her he wasn't going to ask her
17. The teacher asked me how that accident had happened
18. My cousin told me they weren't interested in politics
19. I asked him if he hadn't heard that bell