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

酸得紫苗光烟皇对含主后或礼物堆量贝些超予技往院通松于激极州兴予园彻守担予市吉题鲁界抽加吸仍仪槽讨亿按符决通夺现折其始穿叫跑锈见冰希每牧最例书推顿额

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，

Tom

绍师旗位菌击迎米母龄甚点另谈险忙妈不响少另强伟守近荣内多位恢气洋丰找绳敢枪皮限锻气悬让异稍范革肩短价铝吉际遍况击特欢纪居火号案箱其辉各李灵兴白伤奇任怎前声呀试手层亚如怕覆四销课批传公勇亲追织镜殊误猪济私舞己初剪纪么方镇块暴衡起枝接件缓责篇刺张

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。