Sure! Here are the rewritten sentences:

1. "Be careful," she told me.
2. "Don't wait for me if I'm late," she told me.
3. "Please slow down," she said.
4. She asked me to help her.
5. "Hurry up," she said.
6. She warned us not to go out at night.
7. "Don't touch these buttons," the man said.
8. He warned us not to.
9. "Stay in bed for a few days," she advised me.
10. She told Nam to turn on the light, please.
11. "Don't use my phone," she told me.
12. She told the boys not to play games so much.
13. "Don't watch TV so much," she said to John.
14. She advised me to help my friends.
15. "Don't eat in the class," she advised us.
16. She advised us not to be so lazy.
17. She told us not to write on the wall.
18. She advised us to try our best for the final examination.
19. "Practice English more and more," she told us.
20. She told us to be confident.
21. "Don't worry much about the exam," she said.

Feel free to let me know if you need anything else!