'Come' is in the direction of the speaker and/or listener. 'Go' is in a direction away from the speaker and/or listener. If the direction is toward the listener and away from the speaker, then the speaker will often, through courtesy, use 'come'.
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AnonymousPlease explain when to use come back vs went backScenario 1. You and I are here at my house. I say, "Could you go to the store for me and get me a pound of butter?" You agree. So you go to the store, and then you come back to the house with the butter. You went to the store, and then you came back.