Present participle; Past participle - shuddering - shuddered Present - shudder - shudder - shudders - shudder - shudder - shudder Past - shuddered - shuddered - shuddered - shuddered - shuddered - shuddered Future - will shudder - will shudder - will shudder - will shudder - will shudder - will shudder Present conditional - would shudder - would shudder - would shudder - would shudder - would shudder - would shudder Present Perfect - have shuddered - have shuddered - has shuddered - have shuddered - have shuddered - have shuddered Past Perfect - had shuddered - had shuddered - had shuddered - had shuddered - had shuddered - had shuddered Future Perfect - will have shuddered - will have shuddered - will have shuddered - will have shuddered - will have shuddered - will have shuddered Past conditional - would have shuddered - would have shuddered - would have shuddered - would have shuddered - would have shuddered - would have shuddered Imperative - - - shudder - - - - - - - -