Present participle; Past participle - jamming - jammed Present - jam - jam - jams - jam - jam - jam Past - jammed - jammed - jammed - jammed - jammed - jammed Future - will jam - will jam - will jam - will jam - will jam - will jam Present conditional - would jam - would jam - would jam - would jam - would jam - would jam Present Perfect - have jammed - have jammed - has jammed - have jammed - have jammed - have jammed Past Perfect - had jammed - had jammed - had jammed - had jammed - had jammed - had jammed Future Perfect - will have jammed - will have jammed - will have jammed - will have jammed - will have jammed - will have jammed Past conditional - would have jammed - would have jammed - would have jammed - would have jammed - would have jammed - would have jammed Imperative - - - jam - - - - - - - -