出门请关灯用英语怎么说

"Please turn off the lights when you leave" 是出门请关灯的正确英文表达方式。

这句话的来源可能源于节约能源和环保意识的增强，人们在离开房间或建筑物时应该关掉不必要的灯光，以减少能源浪费。

下面是一些例句：

"Don't forget to turn off the lights when you leave the office."
"I always make sure to turn off the lights when I leave my apartment."
"Please remind everyone to turn off the lights when they leave the classroom."

相应的中文翻译：

"离开办公室时不要忘记关灯。"
"我总是确保离开公寓时关灯。"
"请提醒每个人离开教室时关灯。"