what is this?
It is a clock.
What is that?
That is a ruler.
What is this?
This is a chair.
What is that?
That is a board.
What are those?
They are papers.
What is that?
That is a book.
What are these?
They are pens.
What are these?
They are sharpeners.
What are these?
They are rubbers.
What are these?
These are books.