Four people sit on the steps of the entrance to a building.
Four people are waiting to get into the building.
People may sit on building steps for many reasons, they are not necessarily trying to get into it.
exists e1 x1 x2 x3 x4.(n_entrance(x3) & n_step(x2) & on(e1,x2) & to(x2,x4) & n_building(x4) & of(x2,x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))
exists e1 p1 x1 x2.(n_building(x2) & Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(into(e2,x2) & Actor(e2,x1) & v_get(e2)) & n_people(x1) & card_eq_4(x1))