a man sleeps on a desk.
A man is sleeping.
The man is sleeping goes after a man sleeps.
exists e1 x1 x2.(on(e1,x2) & n_desk(x2) & Actor(e1,x1) & v_sleep(e1) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_man(x1))