Direct and indirect

Can an one help me do solve this question.

Activity:
Convert the following statements into indirect speech.
1. He said, “I can swim.”
2. “I will go home soon,” John said to Mary.
3. He said, “I must work hard.”
4. Dechen said to Dorji, “I had been writing letters.”
5. Karma said, “I was writing letters.”
6. He said to me, “What are you doing?”
7. She said, “My father came yesterday.”
8. The girl said, “I have lost my pen.”
9. Dema says, “I went home on Monday.”
10. They said, “A bad carpenter quarrels with his tools.”