Present participle; Past participle - chuffing - chuffed Present - chuff - chuff - chuffs - chuff - chuff - chuff Past - chuffed - chuffed - chuffed - chuffed - chuffed - chuffed Future - will chuff - will chuff - will chuff - will chuff - will chuff - will chuff Present conditional - would chuff - would chuff - would chuff - would chuff - would chuff - would chuff Present Perfect - have chuffed - have chuffed - has chuffed - have chuffed - have chuffed - have chuffed Past Perfect - had chuffed - had chuffed - had chuffed - had chuffed - had chuffed - had chuffed Future Perfect - will have chuffed - will have chuffed - will have chuffed - will have chuffed - will have chuffed - will have chuffed Past conditional - would have chuffed - would have chuffed - would have chuffed - would have chuffed - would have chuffed - would have chuffed Imperative - - - chuff - - - - - - - -