你离开教室前必须把灯关掉的翻译：Before you leave the classroom must turn off the light 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

You must turn off the light before leaving the classroom

Before you leave the classroom must turn off the light

You leave in front of the classroom to have to switch off the lamp

正在翻译，请等待...

Before you leave the classroom must turn off the light