Hard hat workers are descending into cement walls.
The workers in hard hats are tearing down an old building.
Construction sites of new buildings have cement walls, they don't have to be tearing down anything.
exists e1 x1 x2 x3 x4 x5.(into(e1,x4) & n_wall(x4) & of(x4,x5) & n_cement(x5) & Actor(e1,x1) & v_descend(e1) & n_worker(x1) & of(x1,x3) & n_hat(x3) & (x1 = x2) & ne_nam_hard(x2))
exists e1 s1 s2 s3 x1 x2 x3.(n_worker(x1) & a_down(s3) & Manner(e1,s3) & Theme(e1,x3) & Actor(e1,x1) & v_tear(e1) & n_building(x3) & a_old(s2) & Theme(s2,x3) & in(x1,x2) & n_hat(x2) & a_hard(s1) & Theme(s1,x2))