People are walking down a street.
Pedestrians walk down a street.
Pedestrians that walk down  the street is a rephrasing of people walking down a street.
exists e1 x1 x2.(down(e1,x2) & n_street(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2.(ne_nam_pedestrians(x1) & down(e1,x2) & n_street(x2) & Actor(e1,x1) & v_walk(e1))