后悔的时候用英语怎么表达？

 　　1. I regret doing that.

　　我很后悔那样做。后悔的时候要怎么表达

　　2. I am ashamed of ...

　　我对...感到很羞愧。

　　3. I shouldn't have done it.

　　我真不该那样做。

　　4. If only I...

　　要是...就好了。

　　5. I should have asked you.

　　我要是问你就好了。

　　6. I went a bit too far.

　　我做得有点太过分了。

　　7. It was too careless of me to make such a decision.

　　我做这样的决定太草率了。