I'm sorry my assignment isn't finished. The thing is, I've had a lot of other work this week.

对不起，我的任务没完成。主要原因是我这星期有许多其他工作要做。

《牛津词典》

Sorry, my English is not very good.

对不起，我的英语不太好。

《牛津词典》

I'm sorry—my bad.

对不起，我错了。

《牛津词典》

I admit I do feel sorry for my friend.

VOA: special.2009.10.04

So one example would be a firm that they both earn, sorry, they both own, and another example would be two of you working as a study group on my homework assignment.

也就是说这两家公司互相赚钱,我说错了,是交叉控股,另外一个例子是两名同学,为了做作业组成了一个学习小组

耶鲁公开课 - 博弈论课程节选

I simply don't know because my history isn't very good. So, sorry.

我不知道，是因为我的历史学得不好。所以，很抱歉。

英国电影的魅力 - SpeakingMax英语口语达人

But in China, the first sentence people say to a foreigner is, 'I'm sorry my English is poor.

CNN: ASIANOW - TIME Asia

Sure there is room for two social networks in Brazil (sorry My Space), with Orkut being the Brazilian go-to site, and Facebook being the one for international contacts.

FORBES: Brazil Keeps Google's Orkut Relevant; Tops Facebook

Sorry my response bothers you.

FORBES: Getting Past A Communication Impasse