Present participle; Past participle - curtailing - curtailed Present - curtail - curtail - curtails - curtail - curtail - curtail Past - curtailed - curtailed - curtailed - curtailed - curtailed - curtailed Future - will curtail - will curtail - will curtail - will curtail - will curtail - will curtail Present conditional - would curtail - would curtail - would curtail - would curtail - would curtail - would curtail Present Perfect - have curtailed - have curtailed - has curtailed - have curtailed - have curtailed - have curtailed Past Perfect - had curtailed - had curtailed - had curtailed - had curtailed - had curtailed - had curtailed Future Perfect - will have curtailed - will have curtailed - will have curtailed - will have curtailed - will have curtailed - will have curtailed Past conditional - would have curtailed - would have curtailed - would have curtailed - would have curtailed - would have curtailed - would have curtailed Imperative - - - curtail - - - - - - - -