A child smiling in a park
A child is playing on the swings.
A child smiling in a park is not necessarily playing on the swings.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_smile(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2.(n_swing(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))