Premise: Two people standing on the side of a city street .
Correct statement: There is little chance that two people stand on the side of a city street waiting for a bus .
Incorrect statement: It is certain that two people stand on the side of a city street waiting for a bus .
Correct statement: It is unlikely that two people are waiting for someone .
Incorrect statement: It is certain that two people are waiting for someone .
Correct statement: It is probably not the case that two people are on a corner .
Incorrect statement: It is highly likely that two people are on a corner .
Correct statement: We doubt that a couple is hailing a taxi .
Incorrect statement: It is certain that a couple is hailing a taxi .
Correct statement: It is impossible that a pair of jugglers stand on the side of the street , juggling for donations .
Incorrect statement: It is certain that a pair of jugglers stand on the side of the street , juggling for donations .