Premise: The man is playing a guitar .
Correct statement: There is almost no chance that a street performer plays guitar for a crowded subway station .
Incorrect statement: It is probable that a street performer plays guitar for a crowded subway station .
Correct statement: There is a very good chance that the man is playing a song
Incorrect statement: Chances are slight that the man is playing a song
Correct statement: It is impossible that a man is writing a guitar song for his friend .
Incorrect statement: There is a better than even chance that a man is writing a guitar song for his friend .
Correct statement: It is impossible that there is a grandfather playing an electric guitar .
Incorrect statement: It is highly likely that there is a grandfather playing an electric guitar .
Correct statement: It is impossible that the man is playing a Dragonforce song .
Incorrect statement: It is almost certain that the man is playing a Dragonforce song .