Ответ:

1) A: Is it a classroom? B: No, it isn’t.
2) A: Are they pens? B: Yes, they are.
3) A: Is it an atlas? B: Yes, it is.
4) A: Is it a textbook? B: No, it isn’t.
5) A: Is she a teacher? B: Yes, she is.
6) A: Are they classmates? B: Yes, they are.