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Hundreds of years ago, soldiers began this custom.They shook hands to show that they did not have any weapons in their hands. Now, shaking hands is a custom in most contries. In Britain, you don,t shake hands with friends and family.But you shake hands when you meet a person for the first time. You also say: How do you do? this is not really a question it a formality.The correst answer is the same as the question How do you do?