54.1. This girl's pen. 2. His sister's friend. 3. My brother's dress. 4. Your father's house. 5. Her son's wife. 6. The boy's ball.67. 1. There is2. It is3. There is4. It is5. It is6. It is7. There is 8. There is9. It is 10. It is68. 1. There are2. There is3. There are4. There are 5. There is6. There are7. There are8. There is9. There are10. There is11. There are12. There is13. There are14. There are 69. 1. There are six desks in my classroom.2. Yes, there is a blackboard in my classroom.3. There is at school. 4. There are 3 windows in my classroom. 5. There are some pictures in your classroom.6. There are the pictures on the walls.