Someone walking along a wall.
A kid is walking on a retaining wall afterschool.
Someone doesn't imply a kid.Not every wall is a retaining wall.The fact that someone walking along a wall doesn't imply someone is coming afterschool.
exists x1 x2.(a_topic(x1) & along(x1,x2) & n_wall(x2) & n_walking(x1))
exists e2 e1 x1 x2 x3.(on(e1,x2) & n_afterschool(x2) & of(x2,x3) & n_wall(x3) & Actor(e2,x2) & v_retain(e2) & Actor(e1,x1) & v_walk(e1) & n_kid(x1))