Present participle; Past participle - shamming - shammed Present - sham - sham - shams - sham - sham - sham Past - shammed - shammed - shammed - shammed - shammed - shammed Future - will sham - will sham - will sham - will sham - will sham - will sham Present conditional - would sham - would sham - would sham - would sham - would sham - would sham Present Perfect - have shammed - have shammed - has shammed - have shammed - have shammed - have shammed Past Perfect - had shammed - had shammed - had shammed - had shammed - had shammed - had shammed Future Perfect - will have shammed - will have shammed - will have shammed - will have shammed - will have shammed - will have shammed Past conditional - would have shammed - would have shammed - would have shammed - would have shammed - would have shammed - would have shammed Imperative - - - sham - - - - - - - -