Three people standing at a station.
People are waiting.
If people are standing at a station, it makes sense that they would be waiting.  Most people have a reason for standing at a station, and most reasons for standing at a station involve waiting.
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_station(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists e1 x1.(Actor(e1,x1) & v_wait(e1) & n_people(x1))