Present participle; Past participle - curving - curved Present - curve - curve - curves - curve - curve - curve Past - curved - curved - curved - curved - curved - curved Future - will curve - will curve - will curve - will curve - will curve - will curve Present conditional - would curve - would curve - would curve - would curve - would curve - would curve Present Perfect - have curved - have curved - has curved - have curved - have curved - have curved Past Perfect - had curved - had curved - had curved - had curved - had curved - had curved Future Perfect - will have curved - will have curved - will have curved - will have curved - will have curved - will have curved Past conditional - would have curved - would have curved - would have curved - would have curved - would have curved - would have curved Imperative - - - curve - - - - - - - -