Here are the sentences converted into reported speech:

1. She said that she was not tall.
2. He said that he liked eating candy.
3. Mai said that they would go to work the next day.
4. Daisy said that there were some books on the table.
5. He said that they were waiting for the train at that moment.
6. Mr. Thanh told me that I hadn’t completed my exercise.
7. Thu said that she had stayed at home the week before.
8. Minh said that he hadn’t bought that car.
9. She told me that I didn’t need to worry.
10. My mother said that she wouldn’t have to go to work the next day.
11. Peter asked me if I enjoyed reading.
12. She asked me if I could speak Chinese.
13. The teacher asked me where my father worked.
14. My father told me that I was working too hard.
15. She told him that she didn’t like that film.
16. Mai said that they had eaten there twice.
17. He wanted to know if I was going to build a new house the following month.
18. Thu said that her brother would visit her the following Sunday.
19. David accused Henry of cheating.
20. Minh asked what Hoa was doing.