Convert the following sentences from direct to indirect speech.

Here are the narration changes for each sentence:

1. She said that they had completed the project.
2. The student said that he had not understood the lesson.
3. He told her that she looked happy.
4. The girl said that she might come late.
5. Ramesh said that he had met him the previous week.
6. She said that she would return soon.
7. The teacher said that honesty is the best policy.
8. He said that he was writing a letter.
9. They said that they had been playing cricket.
10. She said that she could solve that sum.
11. Mohan said that he had lost his keys.
12. He said that he had gone to the market.
13. She told him that he was wrong.