The streets of a big city.
The streets of the city at night.
There is no indication it is night it could be day.
exists s1 x1 x2.(n_street(x1) & a_topic(x1) & of(x1,x2) & n_city(x2) & a_big(s1) & Theme(s1,x2))
exists x1 x2 x3.(n_city(x2) & n_street(x1) & a_topic(x1) & of(x1,x2) & at(x2,x3) & n_night(x3))