1. What is the single most common business etiquette
                  mistake that Americans make in your home country?
            I believe
                that the most common mistake is to adopt the attitude that
                things like etiquette is not important, even a waste of
                time. Only discussions and negotiations of the technical
                and financial matters are of value. This view, in my opinion,
                reflects the assumption that every transaction stands on
                its own, without considering subsequent trade.
        Many societies (including many Americans) do not view business
        this way.
            
            2.
                  Culturally, what have you gained both positive and negative
                  since you have been in the U.S.? 
            I am an
                immigrant who has lived in the US for over 20 years. This
                question does not apply to me in the business context.
                Personally, I have gained tremendously.
            
            3.
                  If you were to conduct a seminar entitled "How to
                  do business in your country," what cultural advise
                  would you give to U.S. Americans?
            Meet them
                half way culturally. Although there is truth in the saying "In
                Rome, do as the Roman does", you cannot give up your
                own culture. People would wonder why a person would do
                that. It may even invite contempt. You cannot insist on
                behaving as if you are still within your regular circle.
                That strike people as arrogant.
            Additional
                    Notes
            Here is
                information on Chinese monosyllable language. There is
                no alphabet. Every character occupies one square on the
                paper and has one syllable. No exception. Thus, there are
                lots of homonyms in Chinese. 
            -- "Four" sounds
                very much like death; eight sounds very much like "get
                rich fast". Car licenses with good combinations of
                these characters may cost more than the car. 
            -- Fish
                is the homonym of profit. The saying is: "Every year
                there is profit (fish)." 
            -- The
                characters "to give a clock" are the homonyms
                of "see you on your final trip to the cemetary or
                funeral home."