Change into reported speech:

$\text{1. "Don't forget to post the letter", he said to me.}$

$\rightarrow$ $\textit{He told to me to remmeber/ not to forget to post the letter.}$

$\text{2. "Come and see us again soon", the Smiths said, as we left.}$

$\rightarrow$ $\textit{The Smiths told us to come and see them again soon as we left.}$

$\text{3. The manager said, " Come into my office, please!"}$

$\rightarrow$ $\textit{The manager told me to come into his office.}$

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

Form: $\textit{S + TOLD/ ASKED/ ADVISED + O+ (NOT) + TO_INF}$

`-` Câu tường thuật: Đề nghị: S+ told+ O+ to V/ not to V

`1`. He told me not to forget to post the letter.

`2`. The Smiths told me to come and see them again soon, as we left.

`-` Tân ngữ: us `->` them

`3`. The manager told me to come into the office.