A boy plays on a swing.
There is a boy running around the swing.
He is playing on the swing, not running around it.
exists e1 x1 x2.(on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
exists p1 x1 x4.(n_swing(x4) & exists e1 x2 x3.((x1 = x2) & around(e1,x4) & Actor(e1,x3) & v_run(e1) & (x2 = x3) & n_boy(x2)))