"There is" y "There are" Mean to say "Hay" en español. "There is" is singular y "There are" is plural.
There is a book. (Hay un libro.)*There are books. (Hay libros.)*You can make contractions
For making Questions only enough changing the order:
Is there a book?
Yes, there is.
No, there isn't. There IsAre there books?
Yes, there are.
No, there aren't.
There Are