A man walking on a dirt road.
The man is sitting in the grass.
if the man is walking on a dirt road than he cannot be sitting in grass.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_road(x3) & of(x3,x4) & n_dirt(x4) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_grass(x2) & n_man(x1) & in(e1,x2) & Actor(e1,x1) & v_sit(e1))