Present participle; Past participle - mystifying - mystified Present - mystify - mystify - mystifies - mystify - mystify - mystify Past - mystified - mystified - mystified - mystified - mystified - mystified Future - will mystify - will mystify - will mystify - will mystify - will mystify - will mystify Present conditional - would mystify - would mystify - would mystify - would mystify - would mystify - would mystify Present Perfect - have mystified - have mystified - has mystified - have mystified - have mystified - have mystified Past Perfect - had mystified - had mystified - had mystified - had mystified - had mystified - had mystified Future Perfect - will have mystified - will have mystified - will have mystified - will have mystified - will have mystified - will have mystified Past conditional - would have mystified - would have mystified - would have mystified - would have mystified - would have mystified - would have mystified Imperative - - - mystify - - - - - - - -