Present participle; Past participle - stammering - stammered Present - stammer - stammer - stammers - stammer - stammer - stammer Past - stammered - stammered - stammered - stammered - stammered - stammered Future - will stammer - will stammer - will stammer - will stammer - will stammer - will stammer Present conditional - would stammer - would stammer - would stammer - would stammer - would stammer - would stammer Present Perfect - have stammered - have stammered - has stammered - have stammered - have stammered - have stammered Past Perfect - had stammered - had stammered - had stammered - had stammered - had stammered - had stammered Future Perfect - will have stammered - will have stammered - will have stammered - will have stammered - will have stammered - will have stammered Past conditional - would have stammered - would have stammered - would have stammered - would have stammered - would have stammered - would have stammered Imperative - - - stammer - - - - - - - -