1. teachers / are / many / there / How / their / in / shool ?
⇒ How many teachers are there in their school ?
2. they / in /grade. / are
⇒ They are in grade.
3. his / Does / house / well ?/ have /a
⇒ Does his house have a well ?
4. we / not / students. / are
⇒ We are not students.