I'm sorry (about/for ...) 对不起
I must apologize for ... 我因为...而向你道歉
Apologize to sb 向sb道歉，给sb陪个不是
Excuse me. 不好意思/打扰一下/对不起(抱歉打扰型的，不是I'm sorry那种)
Please accept my apology for ... 请接受我的道歉

来自柯林斯例句

1. I'm sorry. That was a hateful thing to say.

对不起，我不该说那么难听的话。

来自柯林斯例句

2. I'm sorry, I don't know what came over me.

对不起，我不知道自己是怎么回事。

来自柯林斯例句

3. I was impolite and I do beg your pardon.

我失礼了，真对不起。

来自柯林斯例句

4. "Sorry Edward," I said, splattering the cloth with jam.

“对不起，爱德华，”我说道，因为我把果酱洒在了桌布上。

5. "Oh, sorry. I forgot." — "Everyone forgets," the girl sighed.

“哦，对不起，我忘了。”——“每个人都有忘事的时候，”那女孩叹着气说道。