"Remember to turn off the pghts" 可以用英语说成 "Remember to switch off the pghts" 或 "Don't forget to turn off the pghts" 。这个短语来源于英语日常用语，是在提醒别人关灯。
例句：
Remember to switch off the pghts before you leave the room. (离开房间前记得关灯。)
Don't forget to turn off the pghts when you're done in the kitchen. (做饭完后别忘了关灯。)
这个短语是比较常见的英语表达方式，也是比较简单直白的说明关灯的语言表达。