Little boy who is playing in the sand.
Little boy is playing in the sand building a castle.
The child could be doing other things in the sand than building a castle
exists e1 s1 x1 x2 x3.(n_sand(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e2 e1 s1 x1 x2 x3.(n_sand(x2) & for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_build(e2) & n_castle(x3) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))