Present participle; Past participle - sputtering - sputtered Present - sputter - sputter - sputters - sputter - sputter - sputter Past - sputtered - sputtered - sputtered - sputtered - sputtered - sputtered Future - will sputter - will sputter - will sputter - will sputter - will sputter - will sputter Present conditional - would sputter - would sputter - would sputter - would sputter - would sputter - would sputter Present Perfect - have sputtered - have sputtered - has sputtered - have sputtered - have sputtered - have sputtered Past Perfect - had sputtered - had sputtered - had sputtered - had sputtered - had sputtered - had sputtered Future Perfect - will have sputtered - will have sputtered - will have sputtered - will have sputtered - will have sputtered - will have sputtered Past conditional - would have sputtered - would have sputtered - would have sputtered - would have sputtered - would have sputtered - would have sputtered Imperative - - - sputter - - - - - - - -