不能.leave 后用形容词 表示 让某物维持某种状态,所以必须 加一个表示状态的词语,on这里相当于表示状态的形容词.
整个句子意思是：你不在房间里 ,就不要开灯.
leave the lights on 让灯开着.
Don't leave the light on when you are not in the room中的on可不可
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