A couple eating in a restaurant.
they are on a date
All couples need not be on a date.
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_restaurant(x3) & n_eating(x1) & of(x1,x2) & n_couple(x2))
exists p1 x1.(n_thing(x1) & exists x2.(on(x1,x2) & n_date(x2)))