Present participle; Past participle - singing - sung Present - sing - sing - sings - sing - sing - sing Past - sang - sang - sang - sang - sang - sang Future - will sing - will sing - will sing - will sing - will sing - will sing Present conditional - would sing - would sing - would sing - would sing - would sing - would sing Present Perfect - have sung - have sung - has sung - have sung - have sung - have sung Past Perfect - had sung - had sung - had sung - had sung - had sung - had sung Future Perfect - will have sung - will have sung - will have sung - will have sung - will have sung - will have sung Past conditional - would have sung - would have sung - would have sung - would have sung - would have sung - would have sung Imperative - - - sing - - - - - - - -