people waiting for the subway
People sit on speeding subway.
One can not be waiting for the subway while also sitting on the subway.
exists e1 x1 x2 x3.(n_subway(x3) & a_topic(x1) & for(e1,x3) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(on(e1,x2) & n_subway(x2) & of(x2,x3) & n_speeding(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1))