Two people sit on a bench at a park.
A couple watches their children play.
Two people sitting on a park bench doesn't mean they are a couple, let alone are parents watching their children play.
exists e1 x1 x2 x3.(at(e1,x3) & n_park(x3) & on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_watch(e2) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_child(x2) & of(x2,x1) & n_thing(x1) & n_couple(x1))