Present participle; Past participle - gruffing - gruffed Present - gruff - gruff - gruffs - gruff - gruff - gruff Past - gruffed - gruffed - gruffed - gruffed - gruffed - gruffed Future - will gruff - will gruff - will gruff - will gruff - will gruff - will gruff Present conditional - would gruff - would gruff - would gruff - would gruff - would gruff - would gruff Present Perfect - have gruffed - have gruffed - has gruffed - have gruffed - have gruffed - have gruffed Past Perfect - had gruffed - had gruffed - had gruffed - had gruffed - had gruffed - had gruffed Future Perfect - will have gruffed - will have gruffed - will have gruffed - will have gruffed - will have gruffed - will have gruffed Past conditional - would have gruffed - would have gruffed - would have gruffed - would have gruffed - would have gruffed - would have gruffed Imperative - - - gruff - - - - - - - -