A man is working on an unfinished roof.
Worker fixes roof.
YOU WOULD BE ON AN UNFINISHED ROOF TO BE FIXES IT.
exists e1 s1 x1 x2.(on(e1,x2) & n_roof(x2) & a_unfinished(s1) & Theme(s1,x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))
exists e1 x1 x2.(ne_nam_worker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fix(e1) & n_roof(x2))