People crossing a busy street.
Cars are racing around a racetrack.
The cars can either be on a busy street or on a racetrack.  Not both
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_cross(e1) & n_street(x3) & a_busy(s1) & Theme(s1,x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(around(e1,x2) & n_racetrack(x2) & Actor(e1,x1) & v_race(e1) & n_car(x1))