1) There isn't a telephone in my room.
Is there a telephone in my room?
2) There aren't offers and letters on my desk.
Are there offers and letters on my desk?
3) There isn't a computer on our secretary's desk.
Is there a computer on our secretary's desk?
4) There aren't many books and business journals in our library.
Are there many books and business journals in our library?
5) There aren't a lot of newspapers and magazines on the sofa.
Are there a lot of new and magazines on the sofa?