1. Have you told your mother about YOUR boy friend?
2. I don't like this friend of YOURS.
3. They've got two children, but I don't know THEIR names.
4. I spent Christmas Day with the Petersons; THEIRS was the best party I have ever been to.
5.Willy is wearing a cap that isn't HIS .
6.Gina gave HIM the wrong phone number just for fun.