11. The teacher informed us that we had to study hard for the test.

12. He asked her that he had something to show her.

13. The doctor told me that I didn't look after myself properly.

14. The doctor told him that he had a temperature.

15. The doctor told me that I had obviously been ill for several day.

16. The doctor told her thatshe couldn't go to work

17. The doctor told him that he was much too thin.

18. The doctor told me that I needed to stay in bed.

19. The doctor told him that he didn't keep his flat warm enough. 

20. The doctor told me that I could phone him if I felt worse. 

${11.}$ The teacher told us we had to study hard for the test.

${12.}$ He said to her he had something to show her.

${13.}$ The doctor told me I didn't look after my dog properly.

${14.}$ The doctor said to him he had a cold.

${15.}$ She said to me she saw my children quite often.

${16.}$ The doctor said to her she couldn't go to work.

${17.}$ The doctor told him that he was too thin.

${18.}$ The doctor told me that I needed to stay in bed.

${19.}$ The doctor told him he didn't keep his flat warm enough.

${20.}$ The doctor told him he could phone him/her if he felt worse.

→ S + said/ told sb/ said to sb (that) + S + V(lùi thì): câu gián tiếp dạng trần thuật

* Một số thì của động từ lùi thì:

- HTĐ → QKĐ

- HTTD → QKTD

- HTHT → QKHT

- HTHTTD → QKHTTD

- QKĐ → QKHT 

- QKTD → QKHTTD

- is/am/are going to → was/were going to

- can/ will/ shall/ may/ must + V0 → could/ would/ should/ might/ had to + V0