11. The children said that they were waiting for the school bus

12. Mr Brown asked me if I had to go then

13. Tom asked me if I was going to visit my aunt the next day

14. The teacher asked me to listen to her and not to make noise 

15. Mary told Helen that she was tired of eating fish

16. Peter said that the sun always rose in the east

17. Samny told Jean that she hadn't tolen his coat the day before 

18. Miss Lan told us that we had to do our homework everyday

19. Bill asked his teacher if they would read the story

20. Vicky said that he didn't know where Alice was

*Statement:

S + said + (that) + S + V

S + said + to + O + (that) + S + V

S + told + O + (that) + S + V

*Yes - No question: S + asked + (O) + if/ whether + S + V

*Wh - question: S asked + (O) + question word + S + V

*Commands: S + told/ asked + O + (not) + to V

*Requests: S + asked + O + to V

*Lùi thì:

QKĐ → QKHT

HTĐ → QKĐ

HTHT → QKHT

HTTD → QKTD

QKTD → QKHTTD

HTHTTD → QKHTTD

will → would

can → could

may → might 

must → had to

shall → should

be going to → was/ were going to