People walking down the street.
People are moving.
walking is implying moving.
exists e1 x1 x2 x3.(n_street(x3) & a_topic(x1) & down(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1.(Actor(e1,x1) & v_move(e1) & n_people(x1))