Present participle; Past participle - knifing - knifed Present - knife - knife - knifes - knife - knife - knife Past - knifed - knifed - knifed - knifed - knifed - knifed Future - will knife - will knife - will knife - will knife - will knife - will knife Present conditional - would knife - would knife - would knife - would knife - would knife - would knife Present Perfect - have knifed - have knifed - has knifed - have knifed - have knifed - have knifed Past Perfect - had knifed - had knifed - had knifed - had knifed - had knifed - had knifed Future Perfect - will have knifed - will have knifed - will have knifed - will have knifed - will have knifed - will have knifed Past conditional - would have knifed - would have knifed - would have knifed - would have knifed - would have knifed - would have knifed Imperative - - - knife - - - - - - - -