two people sit on a bench.
There is a bench with two people on it.
people sit on a bench means bench with two people on it
exists e1 x1 x2.(on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists p1 x1 x2 x3.((x1 = x2) & with(x2,x3) & on(x3,x2) & n_thing(x2) & n_people(x3) & card_eq_2(x3) & n_bench(x2))