Present participle; Past participle - yowling - yowled Present - yowl - yowl - yowls - yowl - yowl - yowl Past - yowled - yowled - yowled - yowled - yowled - yowled Future - will yowl - will yowl - will yowl - will yowl - will yowl - will yowl Present conditional - would yowl - would yowl - would yowl - would yowl - would yowl - would yowl Present Perfect - have yowled - have yowled - has yowled - have yowled - have yowled - have yowled Past Perfect - had yowled - had yowled - had yowled - had yowled - had yowled - had yowled Future Perfect - will have yowled - will have yowled - will have yowled - will have yowled - will have yowled - will have yowled Past conditional - would have yowled - would have yowled - would have yowled - would have yowled - would have yowled - would have yowled Imperative - - - yowl - - - - - - - -