Premise: A boat with people and their belongings is in the water .
Correct statement: It is certain that a boat is floating in the water with people .
Incorrect statement: We doubt that a boat is floating in the water with people .
Correct statement: There is a very good chance that the boat is moving across the surface of the water .
Incorrect statement: There is little chance that the boat is moving across the surface of the water .
Correct statement: It is probably not the case that a group of people are sailing to the shore .
Incorrect statement: There is a very good chance that a group of people are sailing to the shore .
Correct statement: It is impossible that a three hour tour sets off on its voyage .
Incorrect statement: We believe that a three hour tour sets off on its voyage .
Correct statement: It is impossible that the group of persons are having a birthday party on the boat .
Incorrect statement: We believe that the group of persons are having a birthday party on the boat .