Question

I'm the english teacher, preciso passar para o negativo e interrogativo?!

Answer 1

Olá, boa tarde.

Negativo: No, I'm not the english teacher.

Interrogativo: Am I the english teacher?

Answer 2

It's better with the article A)

Negativo: I'm not the English teacher.

or

 I'm not an English teacher.

Interrogativo: Am I the English teacher?

or

Am I an English teacher?

Are you an English teacher?