
Regret
Past Actions
Used when reflecting on actions you've done that you wish you hadn't.
I regret yelling at you yesterday.
Missed Opportunities
Use it to talk about lost chances or things you didn't do but wish you had.
I regret not learning to play the piano.
Emphasize Feelings
Often used to emphasize personal responsibility and guilt about the past.
He regretted his harsh words bitterly.