A crowd of people waiting at a train crossing.
A group of people were waiting for the train to pass by.
A crowd of people waiting at a train crossing does not imply they were waiting for the train to pass by
exists e2 e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & at(e1,x4) & Actor(e2,x5) & v_cross(e2) & (x4 = x5) & n_train(x4) & Actor(e1,x3) & v_wait(e1) & (x2 = x3) & n_people(x2) & n_crowd(x1))
exists e1 p1 x1 x2 x3.(n_train(x3) & for(e1,x3) & Topic(x3,p1) & exists e2 s1.(a_by(s1) & Manner(e2,s1) & Actor(e2,x3) & v_pass(e2)) & Actor(e1,x1) & v_wait(e1) & of(x1,x2) & n_people(x2) & n_group(x1))