Boy swinging on a swing set.
A child swinging on a swing set.
a child is another term for a boy
exists e1 x1 x2 x3.(ne_nam_boy(x1) & on(e1,x2) & n_set(x2) & of(x2,x3) & n_swing(x3) & Actor(e1,x1) & v_swing(e1))
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_child(x1))