A man is working on an unfinished roof.
Worker eating lunch.
The person is either working or is eating lunch.
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 s1 s2 x1 x2.(n_lunch(x1) & a_.(s2) & Theme(s2,x1) & of(x1,x2) & n_eating(x2) & r_more(s1) & a_worker(s1) & Theme(s1,x1) & a_topic(x1))