Present participle; Past participle - whirring - whirred Present - whirr - whirr - whirrs - whirr - whirr - whirr Past - whirred - whirred - whirred - whirred - whirred - whirred Future - will whirr - will whirr - will whirr - will whirr - will whirr - will whirr Present conditional - would whirr - would whirr - would whirr - would whirr - would whirr - would whirr Present Perfect - have whirred - have whirred - has whirred - have whirred - have whirred - have whirred Past Perfect - had whirred - had whirred - had whirred - had whirred - had whirred - had whirred Future Perfect - will have whirred - will have whirred - will have whirred - will have whirred - will have whirred - will have whirred Past conditional - would have whirred - would have whirred - would have whirred - would have whirred - would have whirred - would have whirred Imperative - - - whirr - - - - - - - -