An African man is working with a wooden machine.
Someone is using a machine
A man working with a machine is not necessarily using a machine.
exists e1 s1 s2 x1 x2.(with(e1,x2) & n_machine(x2) & a_wooden(s2) & Theme(s2,x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & a_african(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_machine(x2) & n_person(x1))