two people sit on a bench.
Two people are dancing a tango.
The people are sitting on a bench, not dancing tango.
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.(Theme(e1,x2) & Actor(e1,x1) & v_dance(e1) & n_tango(x2) & n_people(x1) & card_eq_2(x1))