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The situation is that I am currently living in dorm rooms with a Jewish person who has decided to keep Shabbat. I am a Jew who does not keep Shabbat, but I respect my dorm mate and do not want to inadvertently cause him to break Shabbat. So, I think it might be helpful, during Shabbat, to ask him if he wants the lights turned off or on and help out accordingly.
Therefore, I'm wondering: Can a Jew who is keeping the Shabbat rules ask another Jew who is not keeping shabbat to turn on/off the lights?