A man is lying in the grass.
The man sleeping on a bench.
A man cannot be sleeping while lying on the grass.
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_lie(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & a_topic(x1) & on(e1,x3) & n_bench(x3) & Actor(e1,x2) & v_sleep(e1) & (x1 = x2))