Present participle; Past participle - propping - propped Present - prop - prop - props - prop - prop - prop Past - propped - propped - propped - propped - propped - propped Future - will prop - will prop - will prop - will prop - will prop - will prop Present conditional - would prop - would prop - would prop - would prop - would prop - would prop Present Perfect - have propped - have propped - has propped - have propped - have propped - have propped Past Perfect - had propped - had propped - had propped - had propped - had propped - had propped Future Perfect - will have propped - will have propped - will have propped - will have propped - will have propped - will have propped Past conditional - would have propped - would have propped - would have propped - would have propped - would have propped - would have propped Imperative - - - prop - - - - - - - -