EXPRESSING Regrets in English

We are studying several ways to show that someone regrets or laments a past mistake. Here are the forms:
1) I regret (not) _______ing
2) I should/shouldn't have + past participle
3) I wish I had + past participle
4) If only I had + past participle
5) If I could do it all again, I would/wouldn't have + past participle