Question

1) Put in the negative form (verb to be)
a) I am a teacher
b) We are children

2) Put in the interrogative form (verb to be)
a) He is a typst
b) We are singer

Answer 1

1)
a) I am not a teacher.
b) We are not children.

2)
a) Is he a typst?
b) Are we singer?

Answer 2

1)a) I'm not a teacher. I am not a teacher.
b) We aren't children. We are not children.

2)a) Is he a typist?
b) Are we singers?

As frases contêm erros; já os corrigi nas respostas. ;)