A man working on a circuit board
There is a circuit board in the room.
Not all circuit boards are in a room.
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 p1 x1 x4.(n_room(x4) & exists x2 x3.((x1 = x2) & in(x2,x4) & n_board(x2) & of(x2,x3) & n_circuit(x3)))