A person jumping a horse over a fence.
A jockey is jumping a horse over a fence.
A person jumping a horse could be a jockey.
exists e1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_fence(x4) & Theme(e1,x3) & Actor(e1,x2) & v_jump(e1) & n_horse(x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3.(over(e1,x3) & n_fence(x3) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_horse(x2) & n_jockey(x1))