This man is working on the circuit board.
A man is sleeping on the job.
One can not be sleeping and working simultaneously.
exists e1 x1 x2 x3.(n_board(x2) & of(x2,x3) & n_circuit(x3) & n_man(x1) & on(e1,x2) & Actor(e1,x1) & v_work(e1))
exists e1 x1 x2.(n_job(x2) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1) & n_man(x1))