A man is on a rooftop re-patching the roof.
A plant manager monitoring his workers.
There can either be a man patching the roof or a plant manager.
exists p1 x1 x4.(n_roof(x4) & exists e1 x2 x3.(on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_re-patch(e1) & (x2 = x3) & n_rooftop(x2)) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_monitor(e1) & n_worker(x4) & of(x4,x1) & n_male(x1) & (x1 = x3) & n_manager(x1) & of(x1,x2) & n_plant(x2))