Present participle; Past participle - cluttering - cluttered Present - clutter - clutter - clutters - clutter - clutter - clutter Past - cluttered - cluttered - cluttered - cluttered - cluttered - cluttered Future - will clutter - will clutter - will clutter - will clutter - will clutter - will clutter Present conditional - would clutter - would clutter - would clutter - would clutter - would clutter - would clutter Present Perfect - have cluttered - have cluttered - has cluttered - have cluttered - have cluttered - have cluttered Past Perfect - had cluttered - had cluttered - had cluttered - had cluttered - had cluttered - had cluttered Future Perfect - will have cluttered - will have cluttered - will have cluttered - will have cluttered - will have cluttered - will have cluttered Past conditional - would have cluttered - would have cluttered - would have cluttered - would have cluttered - would have cluttered - would have cluttered Imperative - - - clutter - - - - - - - -