在英语中，表示非常抱歉的常用表达有：

I'm very sorry.

I'm awfully sorry.

I'm terribly sorry.

I'm sorry for what I did.

I can't tell you how sorry I am.

I owe you an apology.

Please accept my sincerest apologies.

It's all my fault. I'll try to make it up to you.

I didn't mean to offend you.

Forgive me, I didn't mean to do that.

根据不同的语境和场合，可以选择合适的表达方式来传达你的歉意。例如，在较为正式的场合，使用“Please accept my sincerest apologies”会更加恰当；而在日常对话中，“I'm very sorry”或“I'm sorry”则更为常见和简洁。