Construction workers working.
Workers are working.
Workers entail construction workers while working or are working.
exists e1 x1 x2.(Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_worker(x1))