They asked what they had to do then 

- Câu tường thuật Wh - questions : S + asked + O + wh - questions ( what , when , why , where , ... ) + S + V ( lùi thì ) 

- Đổi chủ ngữ : We ` -> ` They 

- Lùi thì : Must ` -> ` had to 

- Now ` -> ` Then

`\color{green}{#Queen}`

`=>` They said what they have to do then.

Đáp án `+` Giải thích các bước giải:

$\text{Reported speech : Câu tường thuật}$

$\text{Statements : Dạng câu trần thuật}$

Cth chung $\text{S + said (that) / told O (that) + S + V_lùi thì}$

$\text{I/me/my/your/you/we/us/our}$ 

$\Rightarrow$ Đổi lại cho phù hợp với ngữ cảnh mới của người nói và người nghe. Khi đổi, đổi cùng chức năng ngữ pháp

$\text{+ Verb tense:}$

am/is/are $\rightarrow$ was/were

V_bare/V_s,es $\rightarrow$ V2/Ved

don't/doesn't + V_bare $\rightarrow$ didn't + V_bare

can $\text{+ Verb tense:}$ could

will $\rightarrow$ would

may $\rightarrow$ might

must/have to/has to $\rightarrow$ had to

$\text{+ Time / Place:}$

here $\rightarrow$ there

now $\rightarrow$ then

today $\rightarrow$ that day

tonight $\rightarrow$ that night

tomorrow $\rightarrow$ the following day

this $\rightarrow$ that

these $\rightarrow$ those

next (week/month/year) $\rightarrow$ the following + (week/month/year)

\begin{array}{|c|c|c|}\hline \text{S}&\text{O}&\text{Pronoun Adj}\\\hline \text{I}&\text{me}&\text{my}\\\hline \text{we}&\text{us}&\text{our}\\\hline \text{you}&\text{you}&\text{your}\\\hline \text{they}&\text{them}&\text{their}\\\hline \text{he}&\text{him}&\text{his}\\\hline \text{she}&\text{her}&\text{her}\\\hline \text{it}&\text{it}&\text{its}\\\hline\end{array}