Construction workers work on an unfinished building.
A man watching a sunset.
Person watching a sunset can not work at the same time.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_building(x3) & a_unfinished(s1) & Theme(s1,x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & n_sunset(x3) & (x1 = x2) & n_man(x1))