`4`. Phuong said that she didn't like that red cap.
`->` Câu trần thuật: S + said + (that) + S2 + V lùi thì
`5`. Nh.... said to me that he hadn't finished his work.
`->` Câu trần thuật: S + said to O + (that) + S2 + V lùi thì
`6`. Linda said that she had to go home to make the dinner.
`->` chuyển "must" thành "had to"