Present participle; Past participle - festering - festered Present - fester - fester - festers - fester - fester - fester Past - festered - festered - festered - festered - festered - festered Future - will fester - will fester - will fester - will fester - will fester - will fester Present conditional - would fester - would fester - would fester - would fester - would fester - would fester Present Perfect - have festered - have festered - has festered - have festered - have festered - have festered Past Perfect - had festered - had festered - had festered - had festered - had festered - had festered Future Perfect - will have festered - will have festered - will have festered - will have festered - will have festered - will have festered Past conditional - would have festered - would have festered - would have festered - would have festered - would have festered - would have festered Imperative - - - fester - - - - - - - -