Present participle; Past participle - upturning - upturned Present - upturn - upturn - upturns - upturn - upturn - upturn Past - upturned - upturned - upturned - upturned - upturned - upturned Future - will upturn - will upturn - will upturn - will upturn - will upturn - will upturn Present conditional - would upturn - would upturn - would upturn - would upturn - would upturn - would upturn Present Perfect - have upturned - have upturned - has upturned - have upturned - have upturned - have upturned Past Perfect - had upturned - had upturned - had upturned - had upturned - had upturned - had upturned Future Perfect - will have upturned - will have upturned - will have upturned - will have upturned - will have upturned - will have upturned Past conditional - would have upturned - would have upturned - would have upturned - would have upturned - would have upturned - would have upturned Imperative - - - upturn - - - - - - - -