Present participle; Past participle - thumbing - thumbed Present - thumb - thumb - thumbs - thumb - thumb - thumb Past - thumbed - thumbed - thumbed - thumbed - thumbed - thumbed Future - will thumb - will thumb - will thumb - will thumb - will thumb - will thumb Present conditional - would thumb - would thumb - would thumb - would thumb - would thumb - would thumb Present Perfect - have thumbed - have thumbed - has thumbed - have thumbed - have thumbed - have thumbed Past Perfect - had thumbed - had thumbed - had thumbed - had thumbed - had thumbed - had thumbed Future Perfect - will have thumbed - will have thumbed - will have thumbed - will have thumbed - will have thumbed - will have thumbed Past conditional - would have thumbed - would have thumbed - would have thumbed - would have thumbed - would have thumbed - would have thumbed Imperative - - - thumb - - - - - - - -