1. He showed me his sister 's letter.
2. She took her brother 's skates.
3. Give me your pupils' exercise books.
4. Bring the children's things.
5. Yesterday children found the bird 's nest.
6. This is my friend's family. My friend's father is an engineer. My friend's mother is a teacher.
7. Whose bag is this? It is Tom's bag.
8. Whose dictionaries are these? They are students' dictionaries.
9. Did you see our teacher's book?