Present participle; Past participle - crumbing - crumbed Present - crumb - crumb - crumbs - crumb - crumb - crumb Past - crumbed - crumbed - crumbed - crumbed - crumbed - crumbed Future - will crumb - will crumb - will crumb - will crumb - will crumb - will crumb Present conditional - would crumb - would crumb - would crumb - would crumb - would crumb - would crumb Present Perfect - have crumbed - have crumbed - has crumbed - have crumbed - have crumbed - have crumbed Past Perfect - had crumbed - had crumbed - had crumbed - had crumbed - had crumbed - had crumbed Future Perfect - will have crumbed - will have crumbed - will have crumbed - will have crumbed - will have crumbed - will have crumbed Past conditional - would have crumbed - would have crumbed - would have crumbed - would have crumbed - would have crumbed - would have crumbed Imperative - - - crumb - - - - - - - -