People walking or talking on a city street.
There is no one on the street
When people are walking or talking on the street, the street can't be completely empty.
(exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_street(x2) & of(x2,x3) & n_city(x3) & n_people(x1)) | exists e2 x4 x5 x6.(on(e2,x5) & n_street(x5) & of(x5,x6) & n_city(x6) & Actor(e2,x4) & v_talk(e2) & n_people(x4)))
exists p1 x1 x3.(n_street(x3) & -exists x2.((x1 = x2) & on(x2,x3) & n_one(x2)))