Two boys dig in the sand on a beach.
Two boys play at the beach
Boys that dig in the sand on a beach are actually playing at the beach.
exists x1 x2 x3 x4.(n_sand(x3) & a_topic(x1) & on(x1,x4) & n_beach(x4) & in(x1,x3) & n_dig(x1) & of(x1,x2) & n_boy(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_beach(x2) & at(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))