A white boy prepares food while looking at the camera.
There is a boy preparing a sandwich to eat
You can prepare food, and it not be a sandwich or for that particular person to eat.
exists e1 e2 s1 x1 x2 x3.(n_camera(x3) & while(e1,e2) & at(e2,x3) & Actor(e2,x1) & v_look(e2) & Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & n_food(x2) & n_boy(x1) & a_white(s1) & Theme(s1,x1))
exists p1 x1 e1 p2 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_prepare(e1) & Topic(x4,p2) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x4) & v_eat(e2) & n_thing(x5)) & n_sandwich(x4) & (x2 = x3) & n_boy(x2))