A little boy is playing on a playground rocking toy.
An empty playground.
if a little boy is playing on a playground it is not an empty one.
exists e2 e1 s1 x1 x2 x3.(on(e1,x2) & n_toy(x2) & Actor(e2,x2) & v_rock(e2) & of(x2,x3) & n_playground(x3) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists s1 x1.(a_topic(x1) & n_playground(x1) & a_empty(s1) & Theme(s1,x1))