Is it an eraser?
Yes, it is.
Is it a pencil case?
No, it isn't. It is an eraser.
Is it a book?
No, it isn't. It is pencil case.
Is it a pencil?
No, it isn't. It is a ruler.
Is it a pen?
No, it isn't. It is a pencil.
Is it a pencil?
No, it isn't. It's a ruler.
Is it a pen?
Yes, it is.
Is it a pen?
No, it isn't. It is a pencil case.
Is it a book?
Yes it is.