The girl is on a swing.
A girl is swinging on a tire.
Not all swings are tire swings.
exists p1 x1.(n_girl(x1) & exists x2.(on(x1,x2) & n_swing(x2)))
exists e1 x1 x2.(on(e1,x2) & n_tire(x2) & Actor(e1,x1) & v_swing(e1) & n_girl(x1))