Present participle; Past participle - spurring - spurred Present - spur - spur - spurs - spur - spur - spur Past - spurred - spurred - spurred - spurred - spurred - spurred Future - will spur - will spur - will spur - will spur - will spur - will spur Present conditional - would spur - would spur - would spur - would spur - would spur - would spur Present Perfect - have spurred - have spurred - has spurred - have spurred - have spurred - have spurred Past Perfect - had spurred - had spurred - had spurred - had spurred - had spurred - had spurred Future Perfect - will have spurred - will have spurred - will have spurred - will have spurred - will have spurred - will have spurred Past conditional - would have spurred - would have spurred - would have spurred - would have spurred - would have spurred - would have spurred Imperative - - - spur - - - - - - - -