This is an eraser.
These are erasers.
Those are erasers.
Those are gluesticks.
Those are books.
Those are desks.
That is a desk.
This is a book.
That is a pencil sharpener.
These are gluesticks.
This a desk.
This is a pen.
Those are pens.
These are pens.
These are books.
That is a pen.
This is a pencil sharpener.
That is a book.
That is a gluestick.
These are desks.
That is an eraser.
This is a gluestick.