Present participle; Past participle - engining - engined Present - engine - engine - engines - engine - engine - engine Past - engined - engined - engined - engined - engined - engined Future - will engine - will engine - will engine - will engine - will engine - will engine Present conditional - would engine - would engine - would engine - would engine - would engine - would engine Present Perfect - have engined - have engined - has engined - have engined - have engined - have engined Past Perfect - had engined - had engined - had engined - had engined - had engined - had engined Future Perfect - will have engined - will have engined - will have engined - will have engined - will have engined - will have engined Past conditional - would have engined - would have engined - would have engined - would have engined - would have engined - would have engined Imperative - - - engine - - - - - - - -