Present participle; Past participle - deteriorating - deteriorated Present - deteriorate - deteriorate - deteriorates - deteriorate - deteriorate - deteriorate Past - deteriorated - deteriorated - deteriorated - deteriorated - deteriorated - deteriorated Future - will deteriorate - will deteriorate - will deteriorate - will deteriorate - will deteriorate - will deteriorate Present conditional - would deteriorate - would deteriorate - would deteriorate - would deteriorate - would deteriorate - would deteriorate Present Perfect - have deteriorated - have deteriorated - has deteriorated - have deteriorated - have deteriorated - have deteriorated Past Perfect - had deteriorated - had deteriorated - had deteriorated - had deteriorated - had deteriorated - had deteriorated Future Perfect - will have deteriorated - will have deteriorated - will have deteriorated - will have deteriorated - will have deteriorated - will have deteriorated Past conditional - would have deteriorated - would have deteriorated - would have deteriorated - would have deteriorated - would have deteriorated - would have deteriorated Imperative - - - deteriorate - - - - - - - -