A man is working on top of a roof, working on the shingles.
A man installs a satellite dish.
Shingles and satellite dish are two different objects.
exists e2 e1 x1 x2 x3 x4.(n_shingle(x4) & for(e1,e2) & on(e2,x4) & Actor(e2,x1) & v_work(e2) & on(e1,x2) & of(x2,x3) & n_roof(x3) & n_top(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_install(e1) & n_dish(x2) & of(x2,x3) & n_satellite(x3) & n_man(x1))