Present participle; Past participle - functioning - functioned Present - function - function - functions - function - function - function Past - functioned - functioned - functioned - functioned - functioned - functioned Future - will function - will function - will function - will function - will function - will function Present conditional - would function - would function - would function - would function - would function - would function Present Perfect - have functioned - have functioned - has functioned - have functioned - have functioned - have functioned Past Perfect - had functioned - had functioned - had functioned - had functioned - had functioned - had functioned Future Perfect - will have functioned - will have functioned - will have functioned - will have functioned - will have functioned - will have functioned Past conditional - would have functioned - would have functioned - would have functioned - would have functioned - would have functioned - would have functioned Imperative - - - function - - - - - - - -