词汇：

apologize to sb. for sth.  因为...向某人道歉

awfully 非常

behavior 行为

excuse 借口

failure 失败

fault 错误

forgive 原谅

ignorant 无知的

inconsiderateness 不顾及他人

inconvenience 不方便

make an apology 道歉

make up for it 弥补

misunderstanding 误解

negligent 疏忽的

offend 冒犯

overlook 忽略

regret后悔

remedy 补救

remove  消除

shoulder the responsibility 承担责任

thoughtless 欠考虑的

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（编辑：雨巷）