1. This is John and this is my brother
2. This is Mary's car It's his
3. Your house is big but our is small
4. You can have this book. It's your
5. This is Mike. His....
6. I love my family ...
7. Julie and Ann are sisters. Their surname...
8. Is she his sister ? ....
9. Whose book is this ? It's my (mine тоже возможно)...
10. Their car is expensive but our is cheap