A cloudy sky above a busy city street.
Cars are driving on clouds.
Cars generally drive on a busy street not on clouds.
exists s1 s2 x1 x2 x3.(a_topic(x1) & above(x1,x2) & n_street(x2) & of(x2,x3) & n_city(x3) & a_busy(s2) & Theme(s2,x2) & n_sky(x1) & a_cloudy(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_cloud(x2) & Actor(e1,x1) & v_drive(e1) & n_car(x1))