A barefooted boy on an uncrowded beach.
A boy is playing on a lonely beach.
Just because there is a barefooted boy on an uncrowded beach, it does not necessarily make the beach a lonely beach, nor does it mean that the boy is playing.
exists s1 s2 x1 x2.(a_topic(x1) & on(x1,x2) & n_beach(x2) & a_uncrowded(s2) & Theme(s2,x2) & n_boy(x1) & a_barefooted(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_beach(x2) & a_lonely(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))