Замените существительное с предлогом “of” существительным в форме притяжательного падежа
1. the wife of the teacher
2. the ball of the boy
3. the watch of my friend Peter
4. the opinion of a student
5. the library of my father
6. the sister of his wife
7. the question of the teacher
8. the coat of the boy
9. the exercise-book of the student