一、Apology Letter
     詞匯：
     apologize to sb. for sth. 因?yàn)?..向某人道歉
     awfully 非常
     behavior 行為
     excuse 借口
     failure 失敗
     fault 錯誤
     forgive 原諒
     ignorant 無知的
     inconsiderateness 不顧及他人
     inconvenience 不方便
     make an apology 道歉
     make up for it 彌補(bǔ)
     misunderstanding 誤解
     negligent 疏忽的
     offend 冒犯
     overlook 忽略
     regret后悔
     remedy 補(bǔ)救
     remove 消除
     shoulder the responsibility 承擔(dān)責(zé)任
     thoughtless 欠考慮的
     句型：
     1) I am awfully/terribly sorry for what I have done.
     2) I feel very guilty for what I have done to you.
     3) I am afraid what I have done has caused many inconveniences to you.
     4) I regret to inform. you that I am unable to do…
     5) Please accept my most cordial and humblest apologies for…once more.
     6) I will try my utmost not to make such a stupid mistake again.
     7) I am so sorry to have put you to so much trouble
     二、Inquiry Letter
     詞匯：
     inquire about 咨詢
     seek尋求
     obtain 獲得
     regarding, concerning 關(guān)于
     provide sb with sth 提供
     inform. sb. of sth.通知某人某事
     convenience方便
     look forward to (doing) sth.盼望...
     prompt / immediate 及時的
     take into account of sth. / take sth. into account 考慮到...
     detailed詳細(xì)的
     essential / necessary必要的
     grateful / obliged 感激的
     appreciation感激
     be concerned about... 對...關(guān)心