`=>` My best friend said to me (that) she had just received a postcard from her aunt. 

- Reported speech: Statement

- Cấu trúc: S + said to/ told (+ O) + (that) + S + V(lùi thì)

- Đổi ngôi: I `->` she

- Lùi thì ĐT: Hiện tại hoàn thành `->` Quá khứ hoàn thành ( have just received `->` had just received )

- Đổi tính từ sở hữu: my `->` her 

“I have just received a postcard from my aunt.” my best friend said to me

`->`Answer : My best friend said to me that she had just received a postcard from her aunt.

`=>`Form : S + said to O ( that ) + S + V lùi thì...

`-`I `->`She ( Đổi ngôi )

`-`have just received `->`had just received ( Lùi thì : Hiện tại hoàn thành `->`Quá khứ hoàn thành )

`-`my `->`her