Present participle; Past participle - shacking - shacked Present - shack - shack - shacks - shack - shack - shack Past - shacked - shacked - shacked - shacked - shacked - shacked Future - will shack - will shack - will shack - will shack - will shack - will shack Present conditional - would shack - would shack - would shack - would shack - would shack - would shack Present Perfect - have shacked - have shacked - has shacked - have shacked - have shacked - have shacked Past Perfect - had shacked - had shacked - had shacked - had shacked - had shacked - had shacked Future Perfect - will have shacked - will have shacked - will have shacked - will have shacked - will have shacked - will have shacked Past conditional - would have shacked - would have shacked - would have shacked - would have shacked - would have shacked - would have shacked Imperative - - - shack - - - - - - - -