A child sits on a sidewalk as people walk by.
The child is on the couch.
Once cannot be on a sidewalk and on the couch at the same time.
exists e2 e1 s1 x1 x2 x3 x4.(on(e1,x2) & as(x2,x3) & a_by(s1) & Manner(e2,s1) & Theme(e2,x4) & v_walk(e2) & (x3 = x4) & n_people(x3) & n_sidewalk(x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1))
exists p1 x1 x2.(n_couch(x2) & n_child(x1) & on(x1,x2))