Two men in a boat fishing.
Two men drink beers on a fishing boat
Two men are fishing is not the same as two men drinking although both are on a fishing boat.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_fishing(x2) & of(x2,x3) & n_boat(x3) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_boat(x3) & of(x3,x4) & n_fishing(x4) & Theme(e1,x2) & Actor(e1,x1) & v_drink(e1) & n_beer(x2) & n_man(x1) & card_eq_2(x1))