Is this an eraser?
Yes, it is.
Is this a pencil?
No, it isn't.
Is this a book?
No, it isn't.
Is this a camera?
Yes, it is.
Is this a rubber?
No, it isn't.
Is it a desk?
No, it isn't.
Is this a pen?
No, it isn't.
Is this a board?
Yes, it is.
Is this a camera?
No, it isn't.
Is this a paintbox?
Yes it is.
Is it a desk?
Yes, it is.
Is this a pencil?
Yes, it is.
Is this a book?
Yes, it is.
Is it a board?
No, it isn't.
Is this a chair?
No, it isn't.