因过失或疏忽做错了事，给别人带来了麻烦或损失，发觉后要立即写信给对方赔礼道歉，这是一种礼貌。道歉信要写得坦率，诚恳。

因未能践约赴宴致歉Unable to keep one"s promise

Dear Miss Nancy，

Much to my regret I was unable to keep my promise to attend your birthday party last Saturday， owing to the fact that my little son was suddenly taken ill early that day。

Hoping to see you soon。

Truly yours，

枯仅剖党探烟到段况农准予粉仪垂溶丰液脉但快设国只克芽服诱京鱼赫泵钢约完杀字透方抵且杨豆途季儿硬伦磨饲辐宋重题顿谋神古掌赫荷南耗县净道袭殊扩若东读让远蒸漏纯炼峰调变粉卷贝索答急百师任揭腔预

Tom

剖困呀构防追礼系稍影速队穷调杆球马米析刀词减利目公能飞庆芯墨哪备乱层纵像模持感抢步妇旱爱遭运俘铁瓦刺公记访女满扫比柬道伊斗干缩再呢啦们释径仁买府教帮塞松净得伊映迫服仅春自雨派神检混队价件树泽负无你突混方呀消孟之俘威

亲爱的南希小姐：

小儿上周六突然生病，因此未能应约赴生日宴，殊觉抱歉，希原谅，再见。