3.祝賀信是表示慶祝的書信。在西方風俗習慣中，遇到重大的節假日，比如新年、圣誕節、生日等以及親朋好友之間遇到了什么喜事都應寫信致以問候或贈送禮品。賀信的寫作要注意主題明確，中心突出，情感真摯但切記不要言過其實，評價要恰當，要表現出真誠的喜悅和祝賀。另外，代表單位的賀信應較為正式，措詞要嚴謹、謙恭。
祝賀信常用語：
①Congratulate you on...②It was great to hear that you...③With my whole congratulations and best wishes for...④Luck and success in the coming year! ⑤Please accept our best and sincere wishes for the New Year!⑥Hearty congratulations and all good wishes on this wonderful day in your life!
[例1]March 12, 2004 Dear Wang Ying,We are glad to learn that you are graduating from Beijing University and planning to find a job in a computer company in Beijing.Congratulations on the job well done while at university and good luck to you during your new career.I wish you success in all your undertakings and hope youll enjoy your new career.Anytime you come back home, I wish you would come to my home. Then, we may recall our old happy days. I sincerely hope you will find happiness and success in your new job.Sincerely yours,Li Ping[例2]March 16, 2004 Dear Li Ping,Please accept my warm congratulations on your election as president of the Students Union. I can’t think of anyone who would have been a better choice. I feel that it is a fine tribute from your schoolmates, and a reward you richly deserve for your many years of splendid service to the students in your school.This honor is also due to your ability in dealing with problems, I sincerely hope you will enjoy your work.Yours truly,Zhu Ying
4.感謝信是為了感謝對方的關心、幫助和支持而書寫的信件。在寫感謝信時，正文部分主要寫感謝的內容和感激的心情，可以敘述被感謝的人或事件，重點放在這一幫助所產生的效果上。所用的語言要準確、客觀，情感要真摯。
感謝信常用的句型：
①Thank you very much for...②I am extremely grateful for...③I realize that the task took you a great deal of precious time.④Thank you very much for your hospitality (kindness).⑤Thank you very much for doing so much to make my trip to Beijing interesting.
[例1]Room 608, Friendship HotelMarch 18, 2002 Dear Sir,I am an Englishman, now on a tour in Beijing. This is the first time I am in China. I naturally feel that everything is interesting and strange. Yesterday, when I visited the Great Wall, I was greatly fascinated in this marvelous miracle. Upon my arrival back at the hotel, I found my handbag was missing. There were my passport and a camera in it. I was very worried, feeling that it was completely impossible for me to find it again. At eight oclock in the evening, a young man accompanied by a hotel attendant came to my room with a bag in his hand. I at once recognized that it was my bag. I thanked him heartily for his kindness and offered him a reward of 200 U. S. dollars. But he refused to take even a cent. At my insistence, he told me his name when leaving. He is Zhu Ying of your company. Deeply moved by his selfless spirit, I am writing a letter to commend his noble deed. Please convey my gratitude for him.Yours respectfully,Jack London [例2] Dear Prof. Wang,Thanks to your letter of recommendation to the CEO of Net Ease. I have been given a place in the editorial department at an encouraging salary. I began work last week and I think that I shall enjoy it very much. Mr. Wu, the CEO had a friendly talk with me this morning. He also mentioned your recommendation. I assured him that I would do my best to live up to your recommendation. Prof. Wang, I want to thank you sincerely for your great kindness. Without your help I couldnt have secured this position. Thank you very much. I will do my best not to let you down.Faithfully yours,
Li Ming
作者在文章的開頭通過重復作文的題目巧妙地點了題，接下來用具體的事例來說明這一眾所周知的道理。
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