Four dogs on leashes walk down a sidewalk.
four dogs on leashes are walking
While the dogs walk, it is implied that they are wallking.
exists e1 x1 x2 x3.(down(e1,x3) & n_sidewalk(x3) & Actor(e1,x1) & v_walk(e1) & on(x1,x2) & n_leash(x2) & n_dog(x1) & card_eq_4(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_walk(e1) & on(x1,x2) & n_leash(x2) & n_dog(x1) & card_eq_4(x1))