Who is this?
A teacher
Is it a crayon?
Yes, it is
Is it a book?
Yes, it is
Is it a chair?
Yes, it is
Is it a pencil?
Yes, it is
Who is this?
A student
Is it a desk?
No, it isn't
Is it a desk?
Yes, it is
Is it a book?
No, it isn't
Is it a pencil?
No, it isn't