Present participle; Past participle - plaining - plained Present - plain - plain - plains - plain - plain - plain Past - plained - plained - plained - plained - plained - plained Future - will plain - will plain - will plain - will plain - will plain - will plain Present conditional - would plain - would plain - would plain - would plain - would plain - would plain Present Perfect - have plained - have plained - has plained - have plained - have plained - have plained Past Perfect - had plained - had plained - had plained - had plained - had plained - had plained Future Perfect - will have plained - will have plained - will have plained - will have plained - will have plained - will have plained Past conditional - would have plained - would have plained - would have plained - would have plained - would have plained - would have plained Imperative - - - plain - - - - - - - -