a family walking down the street
There are people out on the street.
Family walking down the street is the same as people out on the street.
exists x1 x2 x3.(n_street(x3) & a_topic(x1) & down(x1,x3) & n_walk(x1) & of(x1,x2) & n_family(x2))
exists p1 x1 x4.(n_street(x4) & exists x2 x3.((x1 = x2) & on(x3,x4) & out(x2,x3) & n_thing(x3) & n_people(x2)))