Formality is the key. Do not use first names unless invited to do so. When you introduce your self, –Karen Williams, you will be called Frau Williams (or they may just Americanize it to make you feel comfortable). People will introduce themselves to you, just using their last names. So you may shake hands with a man who says “Schmidt”, with a brief nod. You would address him as Herr Schmidt. This will occur even…
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