Present participle; Past participle - biffing - biffed Present - biff - biff - biffs - biff - biff - biff Past - biffed - biffed - biffed - biffed - biffed - biffed Future - will biff - will biff - will biff - will biff - will biff - will biff Present conditional - would biff - would biff - would biff - would biff - would biff - would biff Present Perfect - have biffed - have biffed - has biffed - have biffed - have biffed - have biffed Past Perfect - had biffed - had biffed - had biffed - had biffed - had biffed - had biffed Future Perfect - will have biffed - will have biffed - will have biffed - will have biffed - will have biffed - will have biffed Past conditional - would have biffed - would have biffed - would have biffed - would have biffed - would have biffed - would have biffed Imperative - - - biff - - - - - - - -