Premise: A girl in the background takes a picture as many people busily walk by .
Correct statement: We doubt that a girl on Wall Street photographs the wall of financiers walking busily to and fro .
Incorrect statement: It is certain that a girl on Wall Street photographs the wall of financiers walking busily to and fro .
Correct statement: It is impossible that the girl is a journalist
Incorrect statement: It is probably the case that the girl is a journalist
Correct statement: It is impossible that a girl is taking pictures of people headed home for work .
Incorrect statement: Chances are about even that a girl is taking pictures of people headed home for work .
Correct statement: There is a very good chance that the street is crowded
Incorrect statement: There is little chance that the street is crowded
Correct statement: It is impossible that the girl is taking a picture of the other camera operator .
Incorrect statement: It is highly likely that the girl is taking a picture of the other camera operator .