Present participle; Past participle - alternating - alternated Present - alternate - alternate - alternates - alternate - alternate - alternate Past - alternated - alternated - alternated - alternated - alternated - alternated Future - will alternate - will alternate - will alternate - will alternate - will alternate - will alternate Present conditional - would alternate - would alternate - would alternate - would alternate - would alternate - would alternate Present Perfect - have alternated - have alternated - has alternated - have alternated - have alternated - have alternated Past Perfect - had alternated - had alternated - had alternated - had alternated - had alternated - had alternated Future Perfect - will have alternated - will have alternated - will have alternated - will have alternated - will have alternated - will have alternated Past conditional - would have alternated - would have alternated - would have alternated - would have alternated - would have alternated - would have alternated Imperative - - - alternate - - - - - - - -