Is it a backpack?
Yes, it is.
Is it a chair?
Yes, it is
Is it a pen?
No, it isn't. It's a pencil.
Is it a pencil?
Yes, it is.
Is it a shelf?
Yes, it is
Is it a rubber?
No, it isn't. It's a backpack.
Is it a calculator?
No, it isn't. It's a board.
Is it a notebook?
Yes, it is
Is it board?
No, it isn't. It's a book.
Is it a calculator?
No, it isn't. It's a ruler
Is it a ruler?
Yes, it is