A man is working behind caution tape.
A man is sleeping.
I can either be working or sleeping, not both at the same time.
exists e1 x1 x2 x3.(behind(e1,x2) & n_tape(x2) & of(x2,x3) & n_caution(x3) & Actor(e1,x1) & v_work(e1) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_man(x1))