Three men are working on a roof.
The builder replaces the windows.
Working isn't replacing.
exists e1 x1 x2.(on(e1,x2) & n_roof(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_window(x2) & n_builder(x1) & Theme(e1,x2) & Actor(e1,x1) & v_replace(e1))