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