13. Thanh said to her teacher, “Will I finish my exercises at home?”

⇒Thanh said to her teacher if she would finish her exercises at home

14. My friend said, “Are you going to leave tomorrow?”

⇒My friend asked if I was going to leave the day after

15. They said to us, “Must you go now?”

⇒They asked us if we had to go then

16. I asked Nam, “Are you free tonight?”

⇒I asked Nam if he was free that night

17. Nam said to me, “Did you stay at home last night?”

⇒Nam asked me if I had stayed at home the night before

18. The mother asked her son, “Have you finished your homework?”

⇒The mother asked her son if he had finished his homework