Four people standing in front of a bus.
People are sleeping on the bed.
People cannot be standing on a bus and at the same time be sleeping on the bed.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_bus(x4) & n_front(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists e1 x1 x2.(n_bed(x2) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1) & n_people(x1))