Respostas:

1. - Yes, Karen is my sister.

OU

-Yes, she is my sister.

2. - No, that girl is not my friend.

OU

- No, that girl isn’t my friend.

OU

- No, she is not my friend.

3. -No, that is not my father.

OU

-No, that isn’t my father.

OU

-No, he is not my father.

4. -Yes, Charles is my brother.

OU

-Yes, he is my brother.

5. -No, Mr. Lee is not my teacher.

OU

-No, Mr. Lee isn’t my teacher.

OU

-No, he is not my teacher.

6. - Yes, Mrs. Lee is my teacher.

OU

- Yes, she is my teacher.

7. - Yes, this is my brother.

OU

- Yes, he is my brother.

8. - No, that woman is not my mother.

OU

- No, that isn’t my mother.

OU

- No, she is not my mother.

(depende do nível de inglês que você está e o que o professor quer do exercício, todos estão certos).