A young boy walking across pipe over a body of water.
A young boy is skipping rocks on a pond.
Walking and skipping are separate actions.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & across(x1,x3) & over(x3,x4) & of(x4,x5) & n_water(x5) & n_body(x4) & n_pipe(x3) & n_walking(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_pond(x3) & Theme(e1,x2) & Actor(e1,x1) & v_skip(e1) & n_rock(x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))