I am a student.
I am not a student.
Am I a student?
   ⇔

You are nice.
You are not nice.
Are you nice?

He is your bother.
He is not your brother.
Is he your brother?

She is beautiful.
She is not beautiful.
Is she beautiful?

It is a dog.
It is not a dog.
Is it a dog?

We are in class.
We are not in class.
Are we in class?

You are students.
You are not students.
Are you students?

They are in Portugal.
They are not in Portugal.
Are they in Portugal?