These are the keys of the two rooms. 
The keys are for the two rooms.
These keys are for the boats.
The boy is sitting quietly on the floor.
Some believe that flag burning expresses a political view.
A snowboarder in black pants and a black jacket stays on the ground as they are too inexperienced to do tricks yet.
two boys fighting
The girl plays violin.
The early death of smokers actually benefits the budget in some ways.