13. "Don't make this mistake again," his father told him.

• His father told him not to make that mistake again.

14. "Don't leave these books on the table," the librarian said to the students.

• The librarian told the students not to leave those books on the table.

15. Jane said to Bill, "When will you finish your assignment?"

• Jane wondered when Bill would finish his assignment.

16. "I can't chat because I am working now," said John.

• John said that he couldn't chat because he was working at that moment.

17. "My brother wrote this book last year," David said to me.

• David told me that his brother had written that book the previous year.

18. Jane said to us, "I'm having dinner with Rachel tomorrow."

• Jane told us that she was having dinner with Rachel the next day.

19. "We've worked very hard today and it has paid off," the students said.

• The students said that they had worked very hard that day and it had paid off.

20. "I'll see you here next Friday," Tom said to me.

• Tom told me that he would see me there the following Friday.

21. "We'll be writing to you later this week," they said to Maria.

• They told Maria that they would be writing to her later that week.

22. "I don't know where Bill is living at the moment," said Nicky.

• Nicky said that she didn't know where Bill was living at that moment.

23. "My parents left for London at 5 p.m. yesterday," Susan said.

• Susan said that her parents had left for London at 5 p.m. the previous day.

24. "I may see you next week before I leave," Nick said to Sarah.

• Nick told Sarah that he might see her the following week before he left.

25. "I didn't attend the meeting two days ago," said Matt.

• Matt said that he hadn't attended the meeting two days before.