Weren't there seven erasers?
Yes, there were.
Was there a notebook?
No, there was not.
Were there nine erasers?
No, there weren't.
Was there a pen?
Yes, there was.
Were there three rulers?
No, there were not.
Was there a pencil case?
Yes, there was.
Was there a chair?
Yes, there was.
Were there five pencils?
No, there weren't.
Wasn't there a book?
Yes, there was.
Was there one sharpener?
No, there was not.
Were there two backpacks?
No, there were not.
Was there a ruler?
Yes, there was.