Present participle; Past participle - gravel(l)ing - gravel(l)ed Present - gravel - gravel - gravels - gravel - gravel - gravel Past - gravel(l)ed - gravel(l)ed - gravel(l)ed - gravel(l)ed - gravel(l)ed - gravel(l)ed Future - will gravel - will gravel - will gravel - will gravel - will gravel - will gravel Present conditional - would gravel - would gravel - would gravel - would gravel - would gravel - would gravel Present Perfect - have gravel(l)ed - have gravel(l)ed - has gravel(l)ed - have gravel(l)ed - have gravel(l)ed - have gravel(l)ed Past Perfect - had gravel(l)ed - had gravel(l)ed - had gravel(l)ed - had gravel(l)ed - had gravel(l)ed - had gravel(l)ed Future Perfect - will have gravel(l)ed - will have gravel(l)ed - will have gravel(l)ed - will have gravel(l)ed - will have gravel(l)ed - will have gravel(l)ed Past conditional - would have gravel(l)ed - would have gravel(l)ed - would have gravel(l)ed - would have gravel(l)ed - would have gravel(l)ed - would have gravel(l)ed Imperative - - - gravel - - - - - - - -