Young boy playing with rocks.
A boy is amusing himself with stones.
A boy is playing with rocks, and stones is a synonym for rocks.
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_rock(x3) & n_playing(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(with(e1,x2) & n_stone(x2) & Theme(e1,x2) & Actor(e1,x1) & v_amuse(e1) & n_male(x2) & n_boy(x1))