People waiting at a subway station.
people are at a subway
People are waiting for the subway.
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & n_station(x3) & of(x3,x4) & n_subway(x4) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_subway(x2)) & n_people(x1))