A construction worker is using a piece of machinery.
A worker uses a machine.
A construction worker is a worker. Using a piece of machinery can also be described as using a machine.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_use(e1) & of(x3,x4) & n_machinery(x4) & n_piece(x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_machine(x2) & n_worker(x1))