A child is playing at a park.
A boy swinging on a swing set.
A child can be a boy or a girl. Swinging on a swing set is not the only way of playing at a park.
exists e1 x1 x2.(at(e1,x2) & n_park(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_set(x3) & of(x3,x4) & n_swing(x4) & Actor(e1,x2) & v_swing(e1) & (x1 = x2) & n_boy(x1))