$1$ He said his son would be here soon.

→ Will → would

→ S1+said +(that)+S2+V lùi thì +….

$2$ They said they had never been defeated.

→ Have → Had

→ Hiện tại hoàn thành đổi thành quá khứ hoàn thành

→ Cấu trúc QKHT: Had+V3

$3$ She told me she was going to the party with her mother.

→ am → was

→ Tobe going to (hiện tại , am/is/are) đổi thành Tobe going to (quá khứ , was/were)

$4$ They said they had plenty of time to do their work.

→ Have → had

→ Hiện tại hoàn thành đổi thành QKHT

$5$ She said I could come with them if I like .

→ Can → Could

$6$ The old man said he would take me to his house then .

→ Will→ Would

$@Xà Phòng$

`1)` He said thay his son would be here soon. 

`2)` They said that they had never been defeated.

`3)` She told me that she was  going to the party with her mother.

`4)` They said that they had plenty of time to do their work.

`5)` She said that I could come with them if I like .

`6)` The old man said that he would take me to his house then .

*Công thức : `S_1` + said (to somebody ) + (that) +  `S_2` + `V_{lùi thì}`  

*Lưu ý : will ⇒ would ; tomorrow ⇒ the following day / the next day  ; right now ⇒ then