Present participle; Past participle - firming - firmed Present - firm - firm - firms - firm - firm - firm Past - firmed - firmed - firmed - firmed - firmed - firmed Future - will firm - will firm - will firm - will firm - will firm - will firm Present conditional - would firm - would firm - would firm - would firm - would firm - would firm Present Perfect - have firmed - have firmed - has firmed - have firmed - have firmed - have firmed Past Perfect - had firmed - had firmed - had firmed - had firmed - had firmed - had firmed Future Perfect - will have firmed - will have firmed - will have firmed - will have firmed - will have firmed - will have firmed Past conditional - would have firmed - would have firmed - would have firmed - would have firmed - would have firmed - would have firmed Imperative - - - firm - - - - - - - -