Is this a bookcase?
Yes, it is.
What's this?
It's a pen.
What are these?
pencil, book and ruler
What's this?
It's a pencil.
Is this a pen?
No, it isn't.
What's this?
It's a bookcase.
Is this a bag?
No, it isn't.
What's this?
It's a bag.
What's this?
It's a ruler.
What's this?
It's a window.
Is this a door?
No, it isn't.
What's this?
It's a folder.
What's this?
It's a book.
What's this?
It's a rubber.
What's this?
It's a door.