A boy is using a telescope to look at the sky.
A boy looking at stars with a telescope.
the boy is not necessarily looking at the stars, even though he's using a telescope.
exists e1 p1 x1 x2 x3.(n_sky(x3) & Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2.(at(e2,x3) & Actor(e2,x1) & v_look(e2)) & n_telescope(x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & with(x3,x4) & n_telescope(x4) & n_star(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_boy(x1))