Is it a pencil case?
No, it isn't. It's a rubber.
Is it a notebook?
No, it isn't. It's a pen
Is it a notebook?
Yes, it is.
Is it a bag?
No, it isn't. It's a ruler.
Is it a book?
Yes, it is.
Is it a ruler?
No, it isn't. It's a desk.
Is it a pencil?
Yes, it is.
Is it a desk?
No, it isn't. It's a pencil case.
Is it a bag?
Yes, it is.