A lot of people are walking near a train.
A crowd by a train.
A lot of people are a crowd.
exists e1 x1 x2 x3.(near(e1,x3) & n_train(x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_lot(x1))
exists x1 x2.(a_topic(x1) & by(x1,x2) & n_train(x2) & n_crowd(x1))