Q16, The teacher told Nam to come into his office.

Q17, Nga said to her mother she wanted to go shopping with her that afternoon.

Q18, He said his sister wanted to be a singer.

Q19, She said she would buy a new bike the following week.

Q20, She said she didn't know what Mai was doing then.

Q21, Lan told me not to forget to send my parents her regards.

Q22, Mary said to John she could go to the movie theatre with him.

Q23, Linh asked her friend to turn off the light before going out.

`16`. The teacher said to Nam "Come into my office, please".

- The teacher told Nam to come into his/her office.

`17`. "I want to go shopping with you this afternoon", Nga said to her brother.

- Nga said to her brother that she wanted to go shopping with him that afternoon.

`18`. "My sister wants to be a singer" said he.

- He said that his sister wanted to be a singer.

`19`. "I will buy a new bike next week", she said.

- She said that she would buy a new bike the next week.

`20`. "I don't know what Mai is doing now", she said.

- She said that she didn't know what Mai was doing then.

`21`. "Don't forget to send your parents my regards", Lan said.

- Lan told me to send my parents her regards.

`22`. Mary said “I can go to the movies with you, John"

- Mary said to John that she could go to the movies with him.

`23`. Linh said to her friend "Turn off the light before going out"

- Linh told her friend to turn off the light before going out.

*Giải thích:

+) Told sb + to V: bảo ai đó làm gì

+) Câu tường thuật lùi thì.