Present participle; Past participle - yellowing - yellowed Present - yellow - yellow - yellows - yellow - yellow - yellow Past - yellowed - yellowed - yellowed - yellowed - yellowed - yellowed Future - will yellow - will yellow - will yellow - will yellow - will yellow - will yellow Present conditional - would yellow - would yellow - would yellow - would yellow - would yellow - would yellow Present Perfect - have yellowed - have yellowed - has yellowed - have yellowed - have yellowed - have yellowed Past Perfect - had yellowed - had yellowed - had yellowed - had yellowed - had yellowed - had yellowed Future Perfect - will have yellowed - will have yellowed - will have yellowed - will have yellowed - will have yellowed - will have yellowed Past conditional - would have yellowed - would have yellowed - would have yellowed - would have yellowed - would have yellowed - would have yellowed Imperative - - - yellow - - - - - - - -