1. My brother's house is big. house is in a village.
2. My mother's car and my car are dirty. cars are always in the street.
3. That tree is ill. branches are brown.
4. (you) idea is the best.
5. It's not (I) problem. It's (John and Ann's) problem.
6. Those are (Paul's) boots.
7. (Alice's) garden is really beautiful.
8. (The computer's) mouse is very old.
9. (you and your sister's) CDs are all around the room.
10. The pupils are on an excursion and lunch is in a big plastic bag.