Present participle; Past participle - tumbling - tumbled Present - tumble - tumble - tumbles - tumble - tumble - tumble Past - tumbled - tumbled - tumbled - tumbled - tumbled - tumbled Future - will tumble - will tumble - will tumble - will tumble - will tumble - will tumble Present conditional - would tumble - would tumble - would tumble - would tumble - would tumble - would tumble Present Perfect - have tumbled - have tumbled - has tumbled - have tumbled - have tumbled - have tumbled Past Perfect - had tumbled - had tumbled - had tumbled - had tumbled - had tumbled - had tumbled Future Perfect - will have tumbled - will have tumbled - will have tumbled - will have tumbled - will have tumbled - will have tumbled Past conditional - would have tumbled - would have tumbled - would have tumbled - would have tumbled - would have tumbled - would have tumbled Imperative - - - tumble - - - - - - - -