1 This is Marcella's/Marcella mobile phone. 2 Is this notebook your/yours?
3 Who's/Whose rollerblades are these?
4 This is the car's key/key of the car.
5 Who/Who's that man? That's my teacher.
6 This is Nick's and Mary/Nick and Mary's house.
7 Hers/Her birthday is in May.
8 Those are the children's/childrens' grandparents.
9 These bikes are their/theirs.
10 Where are the boys'/boys jackets?
11 What is the address of the house/house's
address?
