A lady working on a machine.
A lady is working
working  implies  is working
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_machine(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_lady(x1))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_lady(x1))