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