Present participle; Past participle - thrumming - thrummed Present - thrum - thrum - thrums - thrum - thrum - thrum Past - thrummed - thrummed - thrummed - thrummed - thrummed - thrummed Future - will thrum - will thrum - will thrum - will thrum - will thrum - will thrum Present conditional - would thrum - would thrum - would thrum - would thrum - would thrum - would thrum Present Perfect - have thrummed - have thrummed - has thrummed - have thrummed - have thrummed - have thrummed Past Perfect - had thrummed - had thrummed - had thrummed - had thrummed - had thrummed - had thrummed Future Perfect - will have thrummed - will have thrummed - will have thrummed - will have thrummed - will have thrummed - will have thrummed Past conditional - would have thrummed - would have thrummed - would have thrummed - would have thrummed - would have thrummed - would have thrummed Imperative - - - thrum - - - - - - - -