Present participle; Past participle - decelerating - decelerated Present - decelerate - decelerate - decelerates - decelerate - decelerate - decelerate Past - decelerated - decelerated - decelerated - decelerated - decelerated - decelerated Future - will decelerate - will decelerate - will decelerate - will decelerate - will decelerate - will decelerate Present conditional - would decelerate - would decelerate - would decelerate - would decelerate - would decelerate - would decelerate Present Perfect - have decelerated - have decelerated - has decelerated - have decelerated - have decelerated - have decelerated Past Perfect - had decelerated - had decelerated - had decelerated - had decelerated - had decelerated - had decelerated Future Perfect - will have decelerated - will have decelerated - will have decelerated - will have decelerated - will have decelerated - will have decelerated Past conditional - would have decelerated - would have decelerated - would have decelerated - would have decelerated - would have decelerated - would have decelerated Imperative - - - decelerate - - - - - - - -