Одна деталь вызывает недоумение. Дайте 5 типов вопросов к предложениям:
she is a teacher ;
they are friends.

She is a teacher.

1. Is she a teacher?
2. Who is she?
3. Who is a teacher?
4. Is she a teacher or a dancer?
5. She is a teacher, isn't she?

They are friends.

1. Are they friends?
2. Who are they?
3. Who is friends?
4. Are they friends or enemies?
5. They are friends, aren't they?