Working on laying cement blocks is hard work.
The construction workers are watching men laying blocks
Just because someone is laying cement blocks does not mean they are construction workers.
exists e1 p1 x1 x2 x3 x4.(ne_nam_working(x1) & exists s1 x5.((x1 = x5) & n_work(x5) & a_hard(s1) & Theme(s1,x5)) & Theme(e1,x3) & Actor(e1,x2) & v_lay(e1) & n_block(x3) & of(x3,x4) & n_cement(x4) & (x1 = x2))
exists e1 e2 x1 x2 x3 x4 x5.(n_worker(x1) & of(x1,x2) & n_construction(x2) & Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & Theme(e1,x5) & Actor(e1,x4) & v_lay(e1) & n_block(x5) & (x3 = x4) & n_man(x3))