Question

The teacher said that man is mortal (narration change )​

Answer 1

$\huge\sf\underline{Required\:Answer}$

The teacher said, "Man is mortal."

Explanation ↴

The given sentence is an universal truth and we know that when the direct speech indicates a ‘general truth’ or ‘universal truth’ and also ‘a continuing habitual action’, ‘the tense form’ of ‘the direct speech will not be changed’, even if the ‘reporting verb’ is in ‘simple past’.