Teacher! I am so sorry, I didn't prepare for the class.
老师!很抱歉，我没有做上课准备。
I’m so sorry.
很抱歉.
I’m terriblely sorry.
非常抱歉.
I’m terribly sorry about that.
为此我非常抱歉.
My apologies.
我道歉.
Please forgive me.
请原谅.
I hope you will excuse me.
希望您能原谅我.
It seems I owe you an apology.
我似乎还欠您个道歉。
Sorry about the inconvenience.
对不起添麻烦了.
It’s my fault. I really feel bad about it.
是我的错. 我真的感到很难过.