A worker wearing a bright vest and black clothes is picking up trash on the ground while people cross the street behind him .
It is probably the case that a worker picks up trash people are throwing on the ground as they walk by
It is probably the case that a worker picks up trash people are throwing on the ground as they walk by
It is probably not the case that a worker picks up trash people are throwing on the ground as they walk by
a worker picks up trash people are throwing on the ground as they walk by