A child wearing shorts is moving a window screen.
A child is holding a window screen.
In order to be moving the window screen, then you have to be holding it.
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x4) & Actor(e2,x1) & v_move(e2) & n_screen(x4) & of(x4,x5) & n_window(x5) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_shorts(x3) & (x1 = x2) & n_child(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_screen(x2) & of(x2,x3) & n_window(x3) & n_child(x1))