Present participle; Past participle - decreasing - decreased Present - decrease - decrease - decreases - decrease - decrease - decrease Past - decreased - decreased - decreased - decreased - decreased - decreased Future - will decrease - will decrease - will decrease - will decrease - will decrease - will decrease Present conditional - would decrease - would decrease - would decrease - would decrease - would decrease - would decrease Present Perfect - have decreased - have decreased - has decreased - have decreased - have decreased - have decreased Past Perfect - had decreased - had decreased - had decreased - had decreased - had decreased - had decreased Future Perfect - will have decreased - will have decreased - will have decreased - will have decreased - will have decreased - will have decreased Past conditional - would have decreased - would have decreased - would have decreased - would have decreased - would have decreased - would have decreased Imperative - - - decrease - - - - - - - -