Present participle; Past participle - staining - stained Present - stain - stain - stains - stain - stain - stain Past - stained - stained - stained - stained - stained - stained Future - will stain - will stain - will stain - will stain - will stain - will stain Present conditional - would stain - would stain - would stain - would stain - would stain - would stain Present Perfect - have stained - have stained - has stained - have stained - have stained - have stained Past Perfect - had stained - had stained - had stained - had stained - had stained - had stained Future Perfect - will have stained - will have stained - will have stained - will have stained - will have stained - will have stained Past conditional - would have stained - would have stained - would have stained - would have stained - would have stained - would have stained Imperative - - - stain - - - - - - - -