考研英语中大作文的要求是内容切题、表达清楚、文字连贯、句式多变和语言规范。小作文考察点在信息点的覆盖、语言的准确性、文章组织的连贯性上。
其中小作文占10分，分为求职信、祝贺信、道歉信、询问信、推荐信、感谢信、邀请信、辞职信等等二十多种应用文。每个类别都有相对固定的语言模式，都有固定词语要求。
投诉信是当人们对某机构的工作人员或其服务不满时，向有关机构的主管或监督人员所做出的书面表述。其内容往往包括对被投诉事件的回忆，投诉人的心里伤害、经济损失，以及投诉人对被投诉方提出的合理补偿要求等。
写作"三步曲"
自我介绍，交代投诉内容，表明本信的目的和要求→说明情况，讲清利害，分析利弊。告诉对方你因此受到的伤害或不便，提出解决问题的建议，表明希望如何处理→表达希望问题得到迅速恰当解决的强烈愿望，希望尽快得到满意的答复。
注意：
写投诉信时语气要冷静、郑重、克制，不必过于礼貌。但也要就事论事，不能进行人身攻击。同时，在描述问题时尽量采用被动句式，使描述更加客观合理。
范文解析：
Directions: Write a letter to a store, making a complaint about its delivery.
You should write about 100 words on ANSWER SHEET
Do not sign your own name at the end of the letter. Use “Wang Hua” instead. Do not write the address.
Dear Sir or Madam,
I am writing to make a complaint against your bad delivery service.
I’m afraid that the enclosed CD player doesn’t work. It is the third one I’ve got to return this month.
Other than the three I’ve had to return recently, I’ve always found your products to be excellent. I would be grateful if you could send a replacement and refund my postage.
I look forward to your reply and proper resolution of my problem, and will until the end of this week before seeking help from a consumer protection agency or the Better Business Bureau. Please contact me by the address on the envelope or by phone at 6668888.
Wang Hua