后悔的時候用英語怎么表達？

　　1. I regret doing that. 我很后悔那樣做。

　　2. I am ashamed of ... 我對...感到很羞愧。

　　3. I shouldn't have done it. 我真不該那樣做。

　　4. If only I... 要是...就好了。

　　5. I should have asked you. 我要是問你就好了。

　　6. I went a bit too far. 我做得有點太過分了。

　　7. It was too careless of me to make such a decision. 我做這樣的決定太草率了。