Present participle; Past participle - lumbering - lumbered Present - lumber - lumber - lumbers - lumber - lumber - lumber Past - lumbered - lumbered - lumbered - lumbered - lumbered - lumbered Future - will lumber - will lumber - will lumber - will lumber - will lumber - will lumber Present conditional - would lumber - would lumber - would lumber - would lumber - would lumber - would lumber Present Perfect - have lumbered - have lumbered - has lumbered - have lumbered - have lumbered - have lumbered Past Perfect - had lumbered - had lumbered - had lumbered - had lumbered - had lumbered - had lumbered Future Perfect - will have lumbered - will have lumbered - will have lumbered - will have lumbered - will have lumbered - will have lumbered Past conditional - would have lumbered - would have lumbered - would have lumbered - would have lumbered - would have lumbered - would have lumbered Imperative - - - lumber - - - - - - - -