People walking down the sidewalk
There are people walking outdoors.
The people  on the sidewalk are outdoors.
exists e1 x1 x2 x3.(n_sidewalk(x3) & a_topic(x1) & down(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & n_outdoors(x4) & (x2 = x3) & n_people(x2))