Premise: A solo snowboarder swooshes down a mountain leaving a cloud of powdery snow in his wake .
Correct statement: It is impossible that a snowboarder rides down a hill .
Incorrect statement: It is certain that a snowboarder rides down a hill .
Correct statement: It is impossible that the snowboarder was the only one of the mountain .
Incorrect statement: We believe that the snowboarder was the only one of the mountain .
Correct statement: It is almost certain that a man on is snowboarding on a mountain .
Incorrect statement: We doubt that a man on is snowboarding on a mountain .
Correct statement: It is impossible that the snowboarder is in the Olympics .
Incorrect statement: Chances are about even that the snowboarder is in the Olympics .
Correct statement: There is almost no chance that the sun shines brightly on the lone snowboarder carving down the mountain .
Incorrect statement: It is probable that the sun shines brightly on the lone snowboarder carving down the mountain .