A busy crosswalk in the city.
The city crosswalk is very busy.
if the city crosswalk is very busy then there must be a busy crosswalk in the city
exists s1 x1 x2.(n_city(x2) & a_topic(x1) & in(x1,x2) & n_crosswalk(x1) & a_busy(s1) & Theme(s1,x1))
exists s1 x1 x2.(n_crosswalk(x1) & of(x1,x2) & n_city(x2) & r_very(s1) & Theme(s1,x1) & a_busy(s1))