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