10. They said, "This is our book." → They said that that was their book.
11. He said, "I am writing a test tomorrow." → He said that he was writing a test the next day.
12. You said, "I will do this for him." → You said that you would do that for him.
13. She said, "I am not hungry now." → She said that she was not hungry then


 

Mình xin trả lời câu hỏi ạ:
   10.  → They said that that was their book.
   11.  → He said that he was writing a test the next day.
   12. → You said that you would do that for him.
   13. → She said that she was not hungry then.