Premise: A man stands behind his fish stand waiting for customers .
Correct statement: It is probable that a man in a blue shirt stands behind his fish stand waiting for customers .
Incorrect statement: It is improbable that a man in a blue shirt stands behind his fish stand waiting for customers .
Correct statement: It is impossible that a man stands behind is newly caught fish .
Incorrect statement: It is certain that a man stands behind is newly caught fish .
Correct statement: It is impossible that a man waits for the doors to be unlocked so he can sell the catch of the day .
Incorrect statement: We believe that a man waits for the doors to be unlocked so he can sell the catch of the day .
Correct statement: It is impossible that he is selling gruper
Incorrect statement: There is a very good chance that he is selling gruper
Correct statement: It is almost certain that someone is helping his customers .
Incorrect statement: We doubt that someone is helping his customers .