A man wearing a gray t-shirt and blue jeans stands ready to hit a golf ball at a driving range .
It is certain that a man is practicing at the driving range before playing 18 holes of golf .
It is impossible that a man is practicing at the driving range before playing 18 holes of golf .
It is certain that a man is practicing at the driving range before playing 18 holes of golf .
A man is practicing at the driving range before playing 18 holes of golf .