一個中心：以完成任務為中心。題目中所有的細節必須涉及，所有的問題必須回答。
兩個基本點：
第一、在考試中，無論遇到哪種類型的書信又或是題目中有任何的具體要求，都要謹記下列的三要素：
1. 明確的指出自己寫信的目的
2. 清晰、準確的陳述事實
3. 使用堅定但禮貌的語言(這一點與概述中提及的內容一致)
在整章中，我會強調每一種類型書信的「目的」：
如果你寫信是要投訴，就用一句話把問題概括，比如：我買的產品不好用;修理工作不徹底;食物太難吃;新租的房子家具太舊等等
如果你寫信尋求幫助，那就清楚的告訴收信人你遇到了什麼困難，你需要哪些具體方面的幫助等
如果你寫求職信，那就說明白為什麼你比別人強
總之，一封有著明確「目的」的信，就像是承載著期望的生命。
下面有三封簡訊，看看它們都帶著什麼樣的目的(雅思考試中最常見類型)
NB (提示): 這些書信僅用於了解上述3要素的重要性，但表達地道、文字精準，值得學習;但是正式考試中，除了需要書信的內容，還要提供稱謂和落款等內容。
書信一、寫信目的：道歉信 (承認錯誤、表示歉意、請求原諒、尋求解決方案)
I’m so sorry I missed our appointment for this morning; I got held up in a faculty meeting and could not break away.
Please call me to reschedule. I am available any weekday except Friday from 2 to 4 P.M., and because I missed our meeting I also am willing to drop by the office any time Saturday if that works better for you.
My apologies.
書信二、寫信目的：抱怨信(描述現象、陳述理由、提出解決)
I have just moved into Apartment 32B, and am enjoying my stay here. However, I do have a concern about one of my neighbors.
When I signed my lease it was emphasized to me that there could be no more than two persons living full-time in a studio apartment. That is definitely not the case in the apartment directly above mine, 33B.
During the one month I have been here, there must have been at least six adults and three young children somehow squeezed into that studio apartment at any one time. The constant noise, the traffic into and out of the apartment, and the four cars they use is very annoying.
Please look into the matter and advise me of the resolution as soon as possible.
書信三、寫信目的： 請求圖書館增加網際網路服務 (介紹身份、描述問題、博得理解)
I am a senior citizen and a regular patron of the Small-town Public Library.
I think we have a fine facility in Small-town, but compared to other libraries in the area we are behind the times. Our library has only two computers connected to the Internet, and the last time I attempted to use the machines, there were six people ahead of me.
Are there any plans to get more computers? I would be happy to participate in a fundraising effort to add more machines and connections to the Internet.