While traveling 35,000 feet above eastern Ohio, United 93 suddenly dropped 700 feet.
( ( While ( traveling ( ( 35,000 feet ) ( above ( eastern Ohio ) ) ) ) ) ( , ( ( United 93 ) ( suddenly ( ( dropped ( 700 feet ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN While) (S (VP (VBG traveling) (NP (NP (CD 35,000) (NNS feet)) (PP (IN above) (NP (JJ eastern) (NNP Ohio))))))) (, ,) (NP (NNP United) (CD 93)) (ADVP (RB suddenly)) (VP (VBD dropped) (NP (CD 700) (NNS feet))) (. .)))
The passengers realized something was going wrong.
( ( The passengers ) ( ( realized ( something ( was ( going wrong ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS passengers)) (VP (VBD realized) (SBAR (S (NP (NN something)) (VP (VBD was) (VP (VBG going) (ADJP (JJ wrong))))))) (. .)))