Premise: A man playing a guitar and a man dancing are entertaining a couple sitting on a ledge by the street .
Correct statement: It is probably the case that two men are busking while a couple watches .
Incorrect statement: It is impossible that two men are busking while a couple watches .
Correct statement: We believe that performers earn their keep
Incorrect statement: There is almost no chance that performers earn their keep
Correct statement: It is improbable that two men have been paid to entertain a couple by the street
Incorrect statement: It is certain that two men have been paid to entertain a couple by the street
Correct statement: It is impossible that the man was using the guitar as a prop .
Incorrect statement: We believe that the man was using the guitar as a prop .
Correct statement: It is impossible that the man is going to propose with the help of the guitarist and dancer .
Incorrect statement: It is probable that the man is going to propose with the help of the guitarist and dancer .