Present participle; Past participle - erring - erred Present - err - err - errs - err - err - err Past - erred - erred - erred - erred - erred - erred Future - will err - will err - will err - will err - will err - will err Present conditional - would err - would err - would err - would err - would err - would err Present Perfect - have erred - have erred - has erred - have erred - have erred - have erred Past Perfect - had erred - had erred - had erred - had erred - had erred - had erred Future Perfect - will have erred - will have erred - will have erred - will have erred - will have erred - will have erred Past conditional - would have erred - would have erred - would have erred - would have erred - would have erred - would have erred Imperative - - - err - - - - - - - -