People stroll down a sidewalk of a city street.
People are walking down a city sidewalk.
The city street  has a sidewalk for the people to stroll and walk down.
exists e1 s1 x1 x2 x3 x4.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_stroll(e1) & of(x2,x3) & n_street(x3) & of(x3,x4) & n_city(x4) & n_sidewalk(x2) & n_people(x1))
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_sidewalk(x2) & of(x2,x3) & n_city(x3) & n_people(x1))