A man is skateboarding in a park, and he is on a wall, and there are other skateboarders in the background.
Man is on wall in park to supervise the people there.
Not all men on a wall are there to supervise.
exists e1 p1 p2 x1 x2 x3 x6 x7.(n_background(x7) & n_skateboarder(x6) & exists x5.((x3 = x5) & in(x5,x7) & -(x5 = x6) & n_skateboarder(x5)) & exists x4.(on(x1,x4) & n_wall(x4)) & n_male(x1) & in(e1,x2) & n_park(x2) & Actor(e1,x1) & v_skateboard(e1) & n_man(x1))
exists p1 x1 x4.(n_people(x4) & exists p2 x2 x3.(on(x1,x2) & Topic(x2,p2) & exists e1 s1.(a_there(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x2) & v_supervise(e1)) & in(x2,x3) & n_park(x3) & n_wall(x2)) & n_man(x1))