Ответ:

1) Tanya isn't ten. She is eleven .

2) Tanya and Helen aren't sisters. They are friends.

3) They aren't from America. They are from Britain.

4) Helen isn't twelve. She is ten.

5) Helen and her friend aren't in class 3 A. They are in class 4 A

6) Their teacher isn't Mr. Lincoln. Their teacher is Mr. Franklin.

7) He isn't from Britain. He is from America.