(ПЕРЕВЕДИТЕ ПОЖАЛУЙСТА БЕЗ ПЕРЕВОДЧИКА)hundreds of years ago,soldiers began this custom.They shook hands to show that they didn't have any weapons in their hands.Now,shaking hands is a custom in most countries.In Britain,you don t shake hands with friends ahd family.But you shake when you meet a person for the first time.You also say:"How do you do?"This is not really a questions,it is a formality .The correct answer is the same as the question:"How do you do?"