1. This is my friend's family. My friend's father is an engineer. My friend`s mother is a teacher.
2. She took her brother's book.
3. Give me your students' notebooks.
4. Is this our teacher's book?
5. Whose bag is this? - This is Pete's bag.
8. Whose dictionaries are these? - They are students' dictionaries.
9. Take the children's toys.