Construction workers are working in a tunnel.
The men are working on builiding a skyscraper.
Skyscraper and tunnel are different.
exists e1 x1 x2 x3.(in(e1,x3) & n_tunnel(x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e2 e1 x1 x2 x3.(n_man(x1) & on(e1,e2) & Theme(e2,x3) & Actor(e2,x2) & v_builide(e2) & n_skyscraper(x3) & Actor(e1,x1) & v_work(e1))