Present participle; Past participle - dampening - dampened Present - dampen - dampen - dampens - dampen - dampen - dampen Past - dampened - dampened - dampened - dampened - dampened - dampened Future - will dampen - will dampen - will dampen - will dampen - will dampen - will dampen Present conditional - would dampen - would dampen - would dampen - would dampen - would dampen - would dampen Present Perfect - have dampened - have dampened - has dampened - have dampened - have dampened - have dampened Past Perfect - had dampened - had dampened - had dampened - had dampened - had dampened - had dampened Future Perfect - will have dampened - will have dampened - will have dampened - will have dampened - will have dampened - will have dampened Past conditional - would have dampened - would have dampened - would have dampened - would have dampened - would have dampened - would have dampened Imperative - - - dampen - - - - - - - -