There is an old man bending over a piece of green machinery.
A man is working on a machine.
If a person is bending over machinery, they are probably working on it.
exists p1 x1 e1 s1 s2 x2 x3 x4 x5.((x1 = x2) & over(e1,x4) & of(x4,x5) & n_machinery(x5) & a_green(s2) & Theme(s2,x5) & n_piece(x4) & Actor(e1,x3) & v_bend(e1) & (x2 = x3) & n_man(x2) & a_old(s1) & Theme(s1,x2))
exists e1 x1 x2.(on(e1,x2) & n_machine(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))