A cloudy sky above a busy city street.
The build-up to an accident is shown on a cloudy day.
a busy street does not necessarily mean an accident
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 s1 x1 x2 x3.(n_build-up(x1) & on(e1,x3) & n_day(x3) & a_cloudy(s1) & Theme(s1,x3) & Theme(e1,x1) & v_show(e1) & to(x1,x2) & n_accident(x2))