Here are the sentences converted into reported speech:

10. He wrote to his lover that he wanted her to know that he thought about her all the time.

11. My grandmother said that it was a lovely day and that she thought she would go for a walk.

12. Her mother said that what she had just told her was very important and asked her to keep it a secret.

13. The man asked my father if he was ready to start, adding that the car was waiting at the gate.

14. The girl answered that she was sixteen years old and that she had been studying English for three years.

15. Mother told us not to stand there doing nothing and to help her with those bags.

16. I advised him to take his raincoat along as it might rain in the afternoon.

17. The boy asked if he might take an apple because they looked so nice.

18. His mother asked him to close the door and windows, saying that it was raining heavily outside.

19. Erik asked if I would mind lending him some money for a few days because he was absolutely broke.

10. He wrote to his lover that he wanted her to know that he thought about her all the time.

11. My grandmother said that it was a lovely day and that she thought she would go for a walk.

12. Her mother said that what she had just told her was very important and asked her to keep it a secret.

13. The man asked my father if he was ready to start, adding that the car was waiting at the gate.

14. The girl answered that she was sixteen years old and that she had been studying English for three years.

15. Mother told us not to stand there doing nothing and to help her with those bags.

16. I advised him to take his raincoat along as it might rain in the afternoon.

17. The boy asked if he might take an apple because they looked so nice.

18. His mother asked him to close the door and windows, saying that it was raining heavily outside.

19. Erik asked if I would mind lending him some money for a few days because he was absolutely broke.