最具有命令性的： Turn off the lights! 稍微不那么没礼貌的可以是： You (should) turn off the lights. 这个还是有点命令语气的了，如果想要委婉些可以这样： Can you turn off the lights? Can you turn off the lights for me? 再委婉客气一点的： Would you please turn off the lights for me? Would you mind turing off the lights for me?
