Present participle; Past participle - dumbing - dumbed Present - dumb - dumb - dumbs - dumb - dumb - dumb Past - dumbed - dumbed - dumbed - dumbed - dumbed - dumbed Future - will dumb - will dumb - will dumb - will dumb - will dumb - will dumb Present conditional - would dumb - would dumb - would dumb - would dumb - would dumb - would dumb Present Perfect - have dumbed - have dumbed - has dumbed - have dumbed - have dumbed - have dumbed Past Perfect - had dumbed - had dumbed - had dumbed - had dumbed - had dumbed - had dumbed Future Perfect - will have dumbed - will have dumbed - will have dumbed - will have dumbed - will have dumbed - will have dumbed Past conditional - would have dumbed - would have dumbed - would have dumbed - would have dumbed - would have dumbed - would have dumbed Imperative - - - dumb - - - - - - - -