Is there an armchair in Tom's room?
No ,there isn't.
Are there a lot of books in Tom's room?
Yes, there are.
Is there a desk in Tom's room?
Yes ,there is.
Are there a lot of toys in Tom's room?
Yes, there are
Is there a sofa in Tom's room?
No, there isn't.
Are there three chairs in Tom's room?
No, there aren't.