介绍信（Letters of Introduction）
社交、亲友之间的相互介绍，常用介绍信联系。介绍信必须写得慎重、谦恭，切忌浮夸。这类信的信封的左下角常写有：To introduce Mr….，或Introducing…,
I have the pleasure of introducing Mr. Ford to you. I hope you will kindly show him attention which I shall consider as shown to myself.
②Dear Mr. Smith,
The bearer of this letter is Mr. Carter, a close friend of mine who desires to spend some time in your town. Any assistance you may render him will be regarded as a personal favor.
Dear Mr. Edwards,
Allow me to introduce to you Mr. George, the bearer of this note. He is my classmate and close friend, and is going to enter your college after graduation here. Will you please give him some necessary guidance in regard to the entrance examination? Any favor you may show him will be sincerely valued.
Dear Mr. Douglas,
I take treat pleasure in introducing to your Mr. Jack Brown, instructor in English in Beijing Normal University, who is going to visit the different schools and colleges in your city. He desires to spend some time there and, it you can furnish him with all facilities during his stay, your kindness will be warmly appreciated.