Present participle; Past participle - tautening - tautened Present - tauten - tauten - tautens - tauten - tauten - tauten Past - tautened - tautened - tautened - tautened - tautened - tautened Future - will tauten - will tauten - will tauten - will tauten - will tauten - will tauten Present conditional - would tauten - would tauten - would tauten - would tauten - would tauten - would tauten Present Perfect - have tautened - have tautened - has tautened - have tautened - have tautened - have tautened Past Perfect - had tautened - had tautened - had tautened - had tautened - had tautened - had tautened Future Perfect - will have tautened - will have tautened - will have tautened - will have tautened - will have tautened - will have tautened Past conditional - would have tautened - would have tautened - would have tautened - would have tautened - would have tautened - would have tautened Imperative - - - tauten - - - - - - - -