16- 1) Are they rich?
2) Is the car dirty?
3) Are you my friend?
4) Are we happy?
5) Am I strong?
6) Is Peter poor?
17- 1) It isn’t (is not) an old car
2) The cats aren’t (are not) white
3) I am not a doctor
4) Mary isn’t a nice girl
5) You aren’t a farmer
6) We aren’t well