People walks on a city sidewalk.
Some people walking outside
A city sidewalk is outside.
exists e1 x1 x2 x3.(on(e1,x2) & n_sidewalk(x2) & of(x2,x3) & n_city(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 s1 x1 x2.(a_topic(x1) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))