please tell Tom not to leave the classroom unless he …… that all the lights are turned off答案添make sure为什么?

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please tell Tom not to leave the classroom unless he …… that all the lights are turned off答案添make sure为什么?
please tell Tom not to leave the classroom unless he …… that all the lights are turned off
答案添make sure
为什么?

please tell Tom not to leave the classroom unless he …… that all the lights are turned off答案添make sure为什么?
请告诉汤姆不要离开教室,除非他确信所有的灯都关掉.这是个从句