Present participle; Past participle - regretting - regretted Present - regret - regret - regrets - regret - regret - regret Past - regretted - regretted - regretted - regretted - regretted - regretted Future - will regret - will regret - will regret - will regret - will regret - will regret Present conditional - would regret - would regret - would regret - would regret - would regret - would regret Present Perfect - have regretted - have regretted - has regretted - have regretted - have regretted - have regretted Past Perfect - had regretted - had regretted - had regretted - had regretted - had regretted - had regretted Future Perfect - will have regretted - will have regretted - will have regretted - will have regretted - will have regretted - will have regretted Past conditional - would have regretted - would have regretted - would have regretted - would have regretted - would have regretted - would have regretted Imperative - - - regret - - - - - - - -