Present participle; Past participle - submarining - submarined Present - submarine - submarine - submarines - submarine - submarine - submarine Past - submarined - submarined - submarined - submarined - submarined - submarined Future - will submarine - will submarine - will submarine - will submarine - will submarine - will submarine Present conditional - would submarine - would submarine - would submarine - would submarine - would submarine - would submarine Present Perfect - have submarined - have submarined - has submarined - have submarined - have submarined - have submarined Past Perfect - had submarined - had submarined - had submarined - had submarined - had submarined - had submarined Future Perfect - will have submarined - will have submarined - will have submarined - will have submarined - will have submarined - will have submarined Past conditional - would have submarined - would have submarined - would have submarined - would have submarined - would have submarined - would have submarined Imperative - - - submarine - - - - - - - -