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1·In this case we write a letter to them as if they were going to receive it and keep it as a reminder of the gratitude we have for them.

如果情况不允许，那我们就写一封信给他们，就仿佛他们能收到它一样，然后保存这封信，时刻提醒自己我们十分感谢这些曾经帮助过我们的人。

2·Please consider this letter as a friendly reminder.

谨以此函向贵方做出友好的支付提醒。

3·I wrote this letter for you to keep, and when you need a reminder of how I feel.

我写这封信给你随时、当你需要提醒我的感受。

4·However, if this letter and your check have crossed in the mail, please accept my apologies for this reminder.

如果这封信和您的支票已经寄出，请让我为写这封信向您致歉。