Dear Mr. Johnson,
I take great pleasure in introducing Mary Brown one of my classmates and best friends to you. She is going to pursue her education as a postgraduate in your university after her graduation here. She and I had lived and studied together for four years. No friend deserves so much love and respect as she does. Now that we have finished our study here we had to part with each other.
Will you please give her some guidance in regard to the entrance examination? Any information you can provide, as well as your introduction for him to meet the future tutor shall be appreciated very much.
Yours truly,
Emma
译文
亲爱的约翰逊先生：
很高兴地向您介绍我的同学也是我的好朋友，玛丽。她毕业后想继续到你们学校读研究生。我们在一起生活和学习了四年。没有一个比她更好的朋友，可是马上要毕业了，我们也不得不面对分离。
你可以给她提供一些有关入学考试的`信息吗?你如果能给她提供一些信息，能帮她安排和导师见面的话，我将非常感谢。
您真挚的：
艾玛
正式介绍信是写信人因公务把自己的同事或业务关系介绍给某单位或某个人。 这种介绍信言和格式比较规范、严谨， 内容一般包括以下几个方面：
(1)简单地介绍一下被介绍人的身份和情况。
(2)说明事由，并要求对方对被介绍人提供某种帮助。
(3)对对方的帮助预先表示感谢。
(4)如果是熟悉的业务往来或老的工作关系，也可以附带询问一下工作上的近况和向对方致以问候。
(5)介绍信一般篇幅不长，前三个方面的内容常常可以放在一个段落里。