(S (NP (BASENP (NNP Noam) (NNP Shalit)) (COMMA ,) (NP (BASENP (NNP Gilad) (POS 's)) (NN father))) (VP (VP (VBZ says) (SBAR (IN that) (S (BASENP (PRP he)) (VP (VBZ is) (ADJP (QT (DQL ``) (ADJP (RB almost) (JJ sure)) (DQR '')) (SBAR (IN that) (S (NP (BASENP (DT the) (NN voice)) (PP (IN on) (BASENP (DT the) (NN tape)))) (VP (VBZ is) (NP (BASENP (DT that)) (PP (IN of) (BASENP (PRPD his) (NN son)))))))))))) (CONJP (COMMA ,) (CC but)) (VP (ADVP (RB also)) (VP (VBZ states) (SBAR (IN that) (QT (DQL ``) (QTC (S (BASENP (PRP we)) (VP (VP (MD can) (RB not)) (VP (VB know) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP it)) (VP (VBD was) (VP (VBN recorded)))))))) (PERIOD .)) (DQR '')))))))