change the narration: teacher said," He is my student"

First you should improve your sentence by adding article "the" before teacher because it's clear here we can't use this sentence for all teachers. It means, it's been talking about a specific teacher here. So it will be:- The teacher said, "He is my student". * The teacher told that he was his student.

Teacher said that he was his student.

teacher said that he was his student.

I think they are right