A person standing on a yellow ladder glues a poster on a wall.
A person is on a ladder.
"On" a ladder is a shorter way to say "standing on a ladder".
exists e2 e1 s1 x1 x2 x3 x4 x5.(on(e2,x5) & n_wall(x5) & Theme(e2,x4) & Actor(e2,x1) & v_glue(e2) & n_poster(x4) & on(e1,x3) & n_ladder(x3) & a_yellow(s1) & Theme(s1,x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_person(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_ladder(x2)) & n_person(x1))