People in the city.
There are people working in the city.
Being in a city doesn't mean the people are working.
exists x1 x2.(n_city(x2) & a_topic(x1) & in(x1,x2) & n_people(x1))
exists p1 x1 x4.(n_city(x4) & exists e1 x2 x3.((x1 = x2) & in(e1,x4) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_people(x2)))