一、Courtesy 规矩

    说话要有礼且谦逊，及时地复书也是规矩的显现。

    例如：

    We have received with many thanks your letter of 20 May, and we take the pleasure of sending you our latest catalog. We wish to draw your attention to a special offer which we have made in it.

    You will be particularly interested in a special offer on page 5 of the latest catalog enclosed, which you requested in your letter of 20 May.

    二、Consideration 关心

    写信时要到处从对方的角度往思量有什么需求，而不是从本身动身，语气上更恭敬对方。

    例如：

    “You earn 2 percent discount when you pay cash. We will send you the brochure next month. ”就比 “We allow 2 percent discount for cash payment. We won't be able to send you the brochure this month.” 要好。

    三、Completeness 完整

    一封商业信函应大要了各项必需的事变，如约请信应申明时候、地点等，确忌寄出迷糊不清的函件。

    四、Clarity 清晰

    意思表达明白，要留意：

    （一）防止用词错误：

    例如：As to the steamers sailing from Hong Kong to San Francisco, we have bimonthly direct services.

    此处bimonthly有比方义：可所以twice a month 大概once two month.故读信者就利诱了，可以改写为：

    1.We have two direct sailings every month from Hong Kong to San Francisco.

    2.We have semimonthly direct sailing from Hong Kong to San Francisco.

    3.We have a direct sailing from Hong Kong to San Francisco.
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