City workers are working on the subway.
people are working outside
The subway is not always outside
exists e1 x1 x2 x3.(n_subway(x3) & on(e1,x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & (x1 = x2) & ne_geo_city(x2))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_people(x1))