This boy is throwing a snowball.
A kid hurling a snowball.
Boy is a kid, and throwing is hurling.
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_snowball(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_hurl(e1) & n_snowball(x3) & (x1 = x2) & n_kid(x1))