7. They weren't at school
=> Were they at school?
8. She didn't give a book
=> Did she give a book?
9. This isn't a book
=> Is this a book?
10. These arn't pens
=> Are these pens?
11. It isn't an elephant
=> Is it an elephant?
12. They aren't teachers.
=> Are they teachers?

1 she is not a teacher
is she a teacher