A man with a cowboy hat is riding a horse that is jumping.
The man is sitting on the grass.
One can't sit on the grass and ride a horse at the same time.
exists e2 e1 x1 x2 x3 x4 x5.(Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & Actor(e1,x5) & v_jump(e1) & (x4 = x5) & n_horse(x4) & with(x1,x2) & n_hat(x2) & of(x2,x3) & n_cowboy(x3) & n_man(x1))
exists e1 x1 x2.(n_grass(x2) & n_man(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))