Two people sitting on a dock.
Two people are sitting.
people sitting on a dock implies sitting.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_dock(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))