A couple sits on a car.
A married couple are on a car, looking at the sky.
Not all couples are married.
exists e1 x1 x2.(on(e1,x2) & n_car(x2) & Actor(e1,x1) & v_sit(e1) & n_couple(x1))
exists e1 p1 s1 x1 x2.(n_sky(x2) & for(p1,e1) & at(e1,x2) & Actor(e1,x1) & v_look(e1) & exists x3.(on(x1,x3) & n_car(x3)) & n_couple(x1) & a_married(s1) & Theme(s1,x1))