People enjoying reading within a city park.
They enjoy reading in the city park every weekend.
Just because people enjoying reading within a city park doesn't imply every weekend.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & within(e1,x4) & n_park(x4) & of(x4,x5) & n_city(x5) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & n_reading(x3) & (x1 = x2) & n_people(x1))
exists e1 p1 x1 x3 x4.(n_park(x3) & of(x3,x4) & n_city(x4) & n_thing(x1) & all x2.(n_weekend(x2) -> exists e2.(Time(e2,x2) & in(e2,x3) & Actor(e2,x1) & v_read(e2))) & Topic(e1,p1) & Actor(e1,x1) & v_enjoy(e1))