sentence: An elderly man is setting up his camera and then goes off to get on his riding mower. sentence:  He appears on the left side riding down the sidewalk until he reaches his lawn. sentence:  He makes a turn and starts working through the grass, going in circles until he reaches the center of the lawn. sentence:  He then goes back and reaches a small patch of grass that he missed the first time. sentence:  He goes back through one more time making sure that he didn't miss any spots, and gets off his lawn mower to turn the camera off.