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?