Present participle; Past participle - underselling - undersold Present - undersell - undersell - undersells - undersell - undersell - undersell Past - undersold - undersold - undersold - undersold - undersold - undersold Future - will undersell - will undersell - will undersell - will undersell - will undersell - will undersell Present conditional - would undersell - would undersell - would undersell - would undersell - would undersell - would undersell Present Perfect - have undersold - have undersold - has undersold - have undersold - have undersold - have undersold Past Perfect - had undersold - had undersold - had undersold - had undersold - had undersold - had undersold Future Perfect - will have undersold - will have undersold - will have undersold - will have undersold - will have undersold - will have undersold Past conditional - would have undersold - would have undersold - would have undersold - would have undersold - would have undersold - would have undersold Imperative - - - undersell - - - - - - - -