A basketball course among the buildings.
There are people on the course.
You can not infer they are on the course.
exists x1 x2 x3.(n_building(x3) & a_topic(x1) & among(x1,x3) & n_course(x1) & of(x1,x2) & n_basketball(x2))
exists p1 x1 x3.(n_course(x3) & exists x2.((x1 = x2) & on(x2,x3) & n_people(x2)))