Two dogs run over the grass.
boy plays hockey
Two dogs cannot simultaneously be one boy.
exists e1 x1 x2.(n_grass(x2) & over(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_hockey(x2) & n_boy(x1))