2) Our teacher is in the classroom.
Our teacher isn't in the classroom.
3) I am thirsty.
I am not thirsty.
4) We are at home now.
We aren't at home now.
5) My bag is black.
My bag isn't black.
6) My parents are from Istanbul.
My parents aren't from Istanbul.
7) I am 17 years old.
I am not 17 years old.
8) It is very hot today.
It isn't very hot today.