一篇九年级英语请求信应该包括以下几个要素：礼貌语言、请求内容、原因说明、对方回应的期望。在写信时要注意语言清晰明了、有条理，同时避免使用过于复杂的句子和词汇。最后，要在信末表达感谢和诚挚的问候。
Dear sirs:
I am writing to you to complpain about my newly-bought electronic dictionary on oct.1,which failed to work only after one week's use.Unfortunately,that dictionary is labelled with your logo.After a careful exam of the "The Product Quality Guarantee",I learned that there is the specific item dealing with my problem.The item enables any concerned customers of my kind to claim for a full refund.Therefore,I am claiming my rights ensured by this document and requesting for a full refund.
For your further examinations on the problem,attached to this letter is the dictionary I have mentioned above,.
I am looking forward to your prompt reply to my request.
Yours
Fatithfully
Mr.Baxter.
