A group of people are watching the trains at a train stop.
people are watching some trains
People watching the trains means they are watching some trains.
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_stop(x4) & of(x4,x3) & n_train(x3) & n_train(x3) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_train(x2) & n_people(x1))