A dog is running on the sand whilst chasing a ball.
the dog is on the beach
Not all sand is necessarily on the beach.
exists e2 e1 x1 x2 x3 x4 x5.(n_whilst(x2) & of(x2,x3) & n_sand(x3) & on(e1,x2) & Theme(e2,x5) & Actor(e2,x4) & v_chase(e2) & n_ball(x5) & (x2 = x4) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists p1 x1 x2.(n_beach(x2) & n_dog(x1) & on(x1,x2))