Two young boys play besides a lake , throwing rocks into the water .
There is almost no chance that two boys are skipping stones while they wait for their fathers to come back with the boat .
There is almost no chance that two boys are skipping stones while they wait for their fathers to come back with the boat .
It is probably the case that two boys are skipping stones while they wait for their fathers to come back with the boat .
Two boys are skipping stones while they wait for their fathers to come back with the boat .