Is this a book?
Yes, it is.
Is this a pen?
Yes, it is.
Is this a table?
No, it isn´t. It´s a chair.
Is this a pencil?
No, it isn´t. It´s an eraser.
Is this a sharpener?
No, it isn´t. It´s a table.
Is this an eraser?
No, It isn´t. It´s a pencil.