Present participle; Past participle - countersigning - countersigned Present - countersign - countersign - countersigns - countersign - countersign - countersign Past - countersigned - countersigned - countersigned - countersigned - countersigned - countersigned Future - will countersign - will countersign - will countersign - will countersign - will countersign - will countersign Present conditional - would countersign - would countersign - would countersign - would countersign - would countersign - would countersign Present Perfect - have countersigned - have countersigned - has countersigned - have countersigned - have countersigned - have countersigned Past Perfect - had countersigned - had countersigned - had countersigned - had countersigned - had countersigned - had countersigned Future Perfect - will have countersigned - will have countersigned - will have countersigned - will have countersigned - will have countersigned - will have countersigned Past conditional - would have countersigned - would have countersigned - would have countersigned - would have countersigned - would have countersigned - would have countersigned Imperative - - - countersign - - - - - - - -