When we leave classroom, we should make sure that all the light are off.
当我们离开教室，我们要确保所有的灯都关了。
I forgot to turn off the light when I left the classroom.
我离开教室的时候忘记关灯了。
Our classroom is lighted with electric light.
我们教室里用电灯照明。
The light in the classroom is poor. ?
译文：教室里的光线不足。?。
I forgot turning off the light when I left the classroom.
我忘记离开教室的时候关过灯了。
Turn off the light when you leave the classroom.
离开教室时请把灯关掉。
Please turn the light off if you were the last one who leaves the classroom.
如果你是最后一个离开教室，请关灯。
Before leave classroom, the light must be shut down.
一定要先关灯再离开教室。
Before leaving classroom, please turn off the light.
离开教室前，请把灯关掉。
There must be nobody in the classroom, for the light is off.
教室里一定没有人，因为灯灭了。(推测性理由)。
Whoever leaves the classroom last should remember to turn off the light before leaving.
不管是谁最后离开教室，都应该记住走之前关灯。
Whoever leaves the classroom last should turn off the light.
不管谁最后离开教室都应把灯关了。
No one should leave the classroom leaving the light on.
任何人不准让灯亮着离开教室。
No one should leave the classroom leaving the light on.
任何人不准让灯亮着离开教室。
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