A group of people walk down the sidewalk in a city.
People are walking.
A group, which are people, are on the sidewalk, which is meant for walking.
exists e1 x1 x2 x3 x4.(n_sidewalk(x3) & down(e1,x3) & in(x3,x4) & n_city(x4) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_people(x1))