假設你剛剛得知你一直做進口生意的朋友john dever先生被提升為a公司副總經理（deputy managing director）,現代表你公司進口部給他寫一封信表示祝賀（reference letter）。
dear mr dever：
it is a pleasure to congratulate you on your recent promotion to deputy managing director of a trading company.
BECause of our close association with you over the past ten years, we know how well you are qualified for this important Office. you earned the promotion through years of hard work and we are delighted to see your true ability win recognition.
agai, congratulations and best wishes for continued success.