Ответ:

1 He is a boy.  Is he a boy?  No, he isn't  a boy.

2 You are a man.  Are you a man? No, you are not a man.

3 She is a woman. Is she a woman? No, she is not a woman.

4 They are girls.   Are they girls? No, they are not girls.

5 We are sisters. Are we sisters? No, we are not sisters.

6 I am his brother. Am I his brother? No, I am not his brother.

7  He is my father. Is he my father? No, he is not my father.

8 She is their mother. Is she their mother? No, she is not their mother.

9  They are engineers. Are they engineers? No, they are not engineers.

10 It's an egg.    Is it an egg?    No, it's not an egg.

11 They are apples. Are they apples?  No, they aren't apples.

12 It's ice.  Is it ice?  No, it's not ice.

13 It is an ice-cream. Is it an ice-cream? No, it is not an ice-cream.

14 It's ink.   Is it ink?    No, it isn't ink.

15  You are doctors.  Are you doctors?  No, you are not doctors.

16 They are teachers. Are they teachers? No, they are not teachers.

17  He is a pilot.   Is he a pilot?   No, he isn't a pilot.

18  I'm a driver. Am I a driver?  No, I am not a driver.