A young boy runs.
There is a kid running.
Young boy referred here as kid
exists s1 x1 x2.(a_topic(x1) & n_run(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_run(e1) & (x2 = x3) & n_kid(x2))