A young girl hangs by a rope while another person lays stairs.
The young girl is using the rope for support.
The young girls could be playing on the rope instead of using the rope for support.  There is nothing to imply that the girl is using the rope for any purpose.
exists e1 p1 s1 x1 x2 x3.(n_person(x3) & exists e2 x4 x5.(Theme(e2,x5) & Actor(e2,x4) & v_lay(e2) & n_stair(x5) & n_person(x4) & -(x4 = x3)) & while(e1,p1) & by(e1,x2) & n_rope(x2) & Actor(e1,x1) & v_hang(e1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_rope(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & for(x2,x3) & n_support(x3))