Use "to be" in the right form:

Проще не придумаешь ))

1. My son is a stugent. 2. His name is Nick. 3. We are teachers.
4. I am a doktor. 5. My friends are engineers. 6. She is a housewife.
7. His daughter is a little girl. She is three years old.
8. They are good friends. 9. I am Russian. I am from Moscow.
10. He is fine now. 11. What are you? - I am a sociologist.
12. Is he a teacher or a student? 13. She is a good student, isn't she?
14. What is your name? - My name is Mary.
15. How old is your brother? - He is tventy-one.

В номере 3 ошибка, должно быть "teachers".
В номере 4 ошибка, должно быть "doctor".
В номере 7 ошибка, должно быть "she is three years old".
В номере 13 ошибка, должно быть "isn't she".
В номере 15 ошибка, должно быть "brother" и "twenty-five".