A person on a bicycle rides down the city sidewalk at night.
The person is on the sidewalk at night.
the person rides down th city sidewalk so he is on the sidewalk.
exists e1 s1 x1 x2 x3 x4 x5.(n_sidewalk(x3) & of(x3,x4) & n_city(x4) & at(e1,x5) & n_night(x5) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_bicycle(x2) & n_person(x1))
exists p1 x1 x2 x3.(n_sidewalk(x3) & n_person(x1) & at(p1,x2) & n_night(x2) & on(x1,x3))