A motocross rider is on a dirt hill.
The man is sleeping on the porch.
A hill is not a porch.
exists p1 x1 x2.(exists x3 x4.(on(x1,x3) & n_hill(x3) & of(x3,x4) & n_dirt(x4)) & n_rider(x1) & of(x1,x2) & n_motocross(x2))
exists e1 x1 x2.(n_porch(x2) & n_man(x1) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1))