Question

he said to the teacher ."May I come in sir?"

Answer 1

Hola

Here is your answer -

Direct speech -

He said to teacher, "May I come in Sir"?

Indirect speech -

Answer -

$\bf{He\:asked\:sir\:if\: he\:might\:come\:in.}$

=> It's a question here, so said replaces to " asked"

=> In indirect speech, the inverted commas are removed and the speakers actual words are changed.

=> In direct speech, the speaker's words are quoted in inverted commas.

=> May will change to might.

Hope it helps!

Answer 2

He asked teacher if he might come in