two people sit on a bench.
Some people wait for the bus.
People sitting on a bench are not necessarily waiting for the bus.
exists e1 x1 x2.(on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_bus(x2) & for(e1,x2) & Actor(e1,x1) & v_wait(e1) & n_people(x1))