1. You better get back to where you came from. 2.You need to go back to where you came from. 3.If you come back their will be problems. Hope this helps

Get back = return to someplace. If I start out from location A, I will say "I will get back by <some time>" = I will return by <sometime> If I say 'go back', I started out in location A and am currently in location B and I mean that I will return from B and arrive at A. <In China> "I will go back to the U.S. next week. If I am in location A, or in location B, talking to a person in location A, I will talk about coming back to A. "I'll come back to the office tomorrow." = I will arrive back in the office tomorrow. I