Is this a pen?
Yes, it is.
It is a green pen.
It that a pencil?
Yes, it is.
It is a red pencil.
Is this a desk?
No, it isn't.
It is a table.
Is that a pick?
No, it isn't.
It is a spade.
These are desks.
Are these tables?
No, they aren't.
They are desks.
Those are knives.
Are those pencils?
No, they aren't.
They are knives.