后悔的时候用英语怎么表达？

　　1. I regret doing that. 我很后悔那样做。

　　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。