1 he isn't a doctor

is he a doctor?

2 That isn't a book

is that a book?

3 she doesn't live on pham hung street

does she live on pham hung street?

4 they aren't students

are they students?

5 there aren't my classmates

are there your classmates?

1.He is a doctor.

(-)He isn't a doctor.

(?)Is he a doctor?
2.That is a book.

(-)That isn't a book.

(?)Is that a book?
3.She lives on Pham Hung street.

(-)She doesn't lives on Pham Hung street.

(?)Where she lives ?
4.They are students.

(-)They aren't students

(?)Are they students?
5.These are my classmates.

(-)These aren't my classmates

(?)Are these my classmates ?