Present participle; Past participle - bellowing - bellowed Present - bellow - bellow - bellows - bellow - bellow - bellow Past - bellowed - bellowed - bellowed - bellowed - bellowed - bellowed Future - will bellow - will bellow - will bellow - will bellow - will bellow - will bellow Present conditional - would bellow - would bellow - would bellow - would bellow - would bellow - would bellow Present Perfect - have bellowed - have bellowed - has bellowed - have bellowed - have bellowed - have bellowed Past Perfect - had bellowed - had bellowed - had bellowed - had bellowed - had bellowed - had bellowed Future Perfect - will have bellowed - will have bellowed - will have bellowed - will have bellowed - will have bellowed - will have bellowed Past conditional - would have bellowed - would have bellowed - would have bellowed - would have bellowed - would have bellowed - would have bellowed Imperative - - - bellow - - - - - - - -