Present participle; Past participle - veining - veined Present - vein - vein - veins - vein - vein - vein Past - veined - veined - veined - veined - veined - veined Future - will vein - will vein - will vein - will vein - will vein - will vein Present conditional - would vein - would vein - would vein - would vein - would vein - would vein Present Perfect - have veined - have veined - has veined - have veined - have veined - have veined Past Perfect - had veined - had veined - had veined - had veined - had veined - had veined Future Perfect - will have veined - will have veined - will have veined - will have veined - will have veined - will have veined Past conditional - would have veined - would have veined - would have veined - would have veined - would have veined - would have veined Imperative - - - vein - - - - - - - -