惭愧的句子，3句。

I am ashamed of you.(我为你感到惭愧)

You should be ashamed.（你应该感到惭愧）

Shame on you!(你真惭愧/丢脸!)

It was shameful that he became a traitor.
（他成了叛徒，这太惭愧了/太丢脸了）

对自己：
i'm sorry. 万能型。可以加一些东西，如 i'm so sorry.等。

对别人：
i feel sorry for you.
i am ashamed of you.
shame on you.

主要就是 sorry 和 shame，ashame 了。

I'm sorry about that!
I am awfully sorry.
I must admit to feeling ashamed.
我得承认我感到惭愧。