Present participle; Past participle - serving - served Present - serve - serve - serves - serve - serve - serve Past - served - served - served - served - served - served Future - will serve - will serve - will serve - will serve - will serve - will serve Present conditional - would serve - would serve - would serve - would serve - would serve - would serve Present Perfect - have served - have served - has served - have served - have served - have served Past Perfect - had served - had served - had served - had served - had served - had served Future Perfect - will have served - will have served - will have served - will have served - will have served - will have served Past conditional - would have served - would have served - would have served - would have served - would have served - would have served Imperative - - - serve - - - - - - - -