Present participle; Past participle - maintaining - maintained Present - maintain - maintain - maintains - maintain - maintain - maintain Past - maintained - maintained - maintained - maintained - maintained - maintained Future - will maintain - will maintain - will maintain - will maintain - will maintain - will maintain Present conditional - would maintain - would maintain - would maintain - would maintain - would maintain - would maintain Present Perfect - have maintained - have maintained - has maintained - have maintained - have maintained - have maintained Past Perfect - had maintained - had maintained - had maintained - had maintained - had maintained - had maintained Future Perfect - will have maintained - will have maintained - will have maintained - will have maintained - will have maintained - will have maintained Past conditional - would have maintained - would have maintained - would have maintained - would have maintained - would have maintained - would have maintained Imperative - - - maintain - - - - - - - -