Premise: Four crosscountry skiers climb uphill .
Correct statement: It is probably not the case that four skiers ski uphill quickly .
Incorrect statement: It is certain that four skiers ski uphill quickly .
Correct statement: We doubt that four crosscountry skiers climb their favorite mountainside .
Incorrect statement: We believe that four crosscountry skiers climb their favorite mountainside .
Correct statement: It is impossible that there are seven skiers in the group .
Incorrect statement: There is a very good chance that there are seven skiers in the group .
Correct statement: It is impossible that the Swedish crosscountry team are on their way to a gold medal .
Incorrect statement: It is certain that the Swedish crosscountry team are on their way to a gold medal .
Correct statement: There is a very good chance that four skiers are having no challenge climbing uphill .
Incorrect statement: It is probably not the case that four skiers are having no challenge climbing uphill .