Nine people are sitting on a sofa smiling.
Everyone is standing.
People are not sitting on a sofa if everyone is standing.
exists e1 x1 x2 x3.(on(e1,x2) & n_smile(x2) & of(x2,x3) & n_sofa(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_9(x1))
all x1.(n_person(x1) -> exists e1.(Actor(e1,x1) & v_stand(e1)))