Present participle; Past participle - preexisting - preexisted Present - preexist - preexist - preexists - preexist - preexist - preexist Past - preexisted - preexisted - preexisted - preexisted - preexisted - preexisted Future - will preexist - will preexist - will preexist - will preexist - will preexist - will preexist Present conditional - would preexist - would preexist - would preexist - would preexist - would preexist - would preexist Present Perfect - have preexisted - have preexisted - has preexisted - have preexisted - have preexisted - have preexisted Past Perfect - had preexisted - had preexisted - had preexisted - had preexisted - had preexisted - had preexisted Future Perfect - will have preexisted - will have preexisted - will have preexisted - will have preexisted - will have preexisted - will have preexisted Past conditional - would have preexisted - would have preexisted - would have preexisted - would have preexisted - would have preexisted - would have preexisted Imperative - - - preexist - - - - - - - -