What are they ?
They're books.
What is this ?
It's a rubber
What are they?
They're pens
What are they?
They're rulers
What are they?
They're rubbers
What is this ?
It's a book.
What is this ?
It's a pencil
What is this ?
It's a pen
What are they?
They're pencils
What is this ?
It's a ruler