Two dogs play on the grass.
The pets are sitting on a couch.
The pets may not be dogs and they are either on the couch or the grass.
exists e1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_pet(x1) & on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1))