People are walking past one another.
People walk down a city street.
Walking past is the same as walk down.
exists e1 s1 x1 x2.(past(e1,x2) & n_thing(x2) & card_eq_1(x2) & a_another(s1) & Theme(s1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(down(e1,x2) & n_street(x2) & of(x2,x3) & n_city(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))