An old woman is sitting on a bench , while behind her a limo pulls up and two people in white are walking by .
It is certain that an old woman is on a bench waits for her limo driver .
It is impossible that an old woman is on a bench waits for her limo driver .
It is certain that an old woman is on a bench waits for her limo driver .
An old woman is on a bench waits for her limo driver .