Present participle; Past participle - suing - sued Present - sue - sue - sues - sue - sue - sue Past - sued - sued - sued - sued - sued - sued Future - will sue - will sue - will sue - will sue - will sue - will sue Present conditional - would sue - would sue - would sue - would sue - would sue - would sue Present Perfect - have sued - have sued - has sued - have sued - have sued - have sued Past Perfect - had sued - had sued - had sued - had sued - had sued - had sued Future Perfect - will have sued - will have sued - will have sued - will have sued - will have sued - will have sued Past conditional - would have sued - would have sued - would have sued - would have sued - would have sued - would have sued Imperative - - - sue - - - - - - - -