A woman is working on the computer.
 A woman with a computer.
A woman is working on a computer.
exists e1 x1 x2.(n_computer(x2) & on(e1,x2) & Actor(e1,x1) & v_work(e1) & n_woman(x1))
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_computer(x2) & n_woman(x1))