(S (S (BASENP (PRP It)) (VP (VP (VBZ is) (RB not)) (VP (VP (VBN known) (PP (IN at) (BASENP (DT this) (NN time)))) (SBAR (IN if) (S (BASENP (DT the) (NN six) (NNS miners)) (VP (VBP are) (ADJP (JJ alive) (CC or) (JJ dead)))))))) (PERIOD .))