One of the passengers who mentioned a bomb expressed his belief that it was not real.
( ( One ( of ( ( the passengers ) ( who ( mentioned ( a bomb ) ) ) ) ) ) ( ( ( expressed ( his belief ) ) ( that ( it ( ( was not ) real ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (NNS passengers)) (SBAR (WHNP (WP who)) (S (VP (VBD mentioned) (NP (DT a) (NN bomb)))))))) (VP (VBD expressed) (NP (PRP$ his) (NN belief)) (SBAR (IN that) (S (NP (PRP it)) (VP (VBD was) (RB not) (ADJP (JJ real)))))) (. .)))
Everyone was certain that the bomb was real and would kill them all.
( Everyone ( ( ( was certain ) ( that ( ( the bomb ) ( ( ( was real ) and ) ( would ( kill ( them all ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Everyone)) (VP (VBD was) (ADJP (JJ certain)) (SBAR (IN that) (S (NP (DT the) (NN bomb)) (VP (VP (VBD was) (ADJP (JJ real))) (CC and) (VP (MD would) (VP (VB kill) (S (NP (PRP them)) (NP (DT all))))))))) (. .)))