Present participle; Past participle - smoothing - smoothed Present - smooth - smooth - smooths - smooth - smooth - smooth Past - smoothed - smoothed - smoothed - smoothed - smoothed - smoothed Future - will smooth - will smooth - will smooth - will smooth - will smooth - will smooth Present conditional - would smooth - would smooth - would smooth - would smooth - would smooth - would smooth Present Perfect - have smoothed - have smoothed - has smoothed - have smoothed - have smoothed - have smoothed Past Perfect - had smoothed - had smoothed - had smoothed - had smoothed - had smoothed - had smoothed Future Perfect - will have smoothed - will have smoothed - will have smoothed - will have smoothed - will have smoothed - will have smoothed Past conditional - would have smoothed - would have smoothed - would have smoothed - would have smoothed - would have smoothed - would have smoothed Imperative - - - smooth - - - - - - - -