A worker wearing a bright vest and black clothes is picking up trash on the ground while people cross the street behind him .
There is a very good chance that a man in a bright vest , black clothes is picking up trash in a city park while people are crossing a street behind him .
There is a very good chance that a man in a bright vest , black clothes is picking up trash in a city park while people are crossing a street behind him .
We doubt that a man in a bright vest , black clothes is picking up trash in a city park while people are crossing a street behind him .
A man in a bright vest , black clothes is picking up trash in a city park while people are crossing a street behind him .