Преобразуйтесь данные предложения в косвенную речь

15. (I wondered) Did Jack call back?

16. (I wondered) Did hens lay eggs?

17. (He advised me) You ought to see the doctor.

18. (She asked him) Would you like a drink?

19. (I knew) I saw him once before in Paris.

20. (The professor said) Shakespeare didn't speak French.

Заранее спасибо.