Boy jumping steps with skateboard
The boy is going to hit is head.
A boy cannot be jumping and hit his head.
exists e1 x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_skateboard(x3) & n_step(x1) & Actor(e1,x1) & v_jump(e1) & (x1 = x2) & ne_nam_boy(x2))
exists e1 p1 p2 x1 x2.(n_boy(x1) & exists x3.((x1 = x3) & n_head(x3)) & Topic(e1,p1) & Actor(e1,x2) & v_go(e1) & exists e2.(Actor(e2,x2) & v_hit(e2)) & (x1 = x2))