Premise: Two men in black shirts do handstands on a stage .
Correct statement: It is improbable that two gymnasts are practicing their routine .
Incorrect statement: We believe that two gymnasts are practicing their routine .
Correct statement: It is impossible that the men are n't wearing pants .
Incorrect statement: It is certain that the men are n't wearing pants .
Correct statement: It is probable that two men in black shirts do handstands on a stage as onlookers pass by .
Incorrect statement: It is highly unlikely that two men in black shirts do handstands on a stage as onlookers pass by .
Correct statement: It is impossible that two men are unable to walk on their legs , so they have gotten accustomed to using their hands .
Incorrect statement: Chances are about even that two men are unable to walk on their legs , so they have gotten accustomed to using their hands .
Correct statement: There is a very good chance that acrobats do a routine for an audience .
Incorrect statement: There is almost no chance that acrobats do a routine for an audience .