A man working on a circuit board
A man is repairing a broken circuit board.
Not everyone is working on a circuit board is repairing it.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_board(x3) & of(x3,x4) & n_circuit(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_repair(e1) & n_board(x2) & of(x2,x3) & n_circuit(x3) & a_broken(s1) & Theme(s1,x2) & n_man(x1))