Present participle; Past participle - stoppering - stoppered Present - stopper - stopper - stoppers - stopper - stopper - stopper Past - stoppered - stoppered - stoppered - stoppered - stoppered - stoppered Future - will stopper - will stopper - will stopper - will stopper - will stopper - will stopper Present conditional - would stopper - would stopper - would stopper - would stopper - would stopper - would stopper Present Perfect - have stoppered - have stoppered - has stoppered - have stoppered - have stoppered - have stoppered Past Perfect - had stoppered - had stoppered - had stoppered - had stoppered - had stoppered - had stoppered Future Perfect - will have stoppered - will have stoppered - will have stoppered - will have stoppered - will have stoppered - will have stoppered Past conditional - would have stoppered - would have stoppered - would have stoppered - would have stoppered - would have stoppered - would have stoppered Imperative - - - stopper - - - - - - - -