The Vice President was wondering how the hell could a plane hit the World Trade Center when he saw the second aircraft strike the South Tower.
( ( ( The ( Vice President ) ) ( was ( wondering ( how ( ( the hell ) could ) ) ) ) ) ( ( a plane ) ( ( hit ( ( the ( World ( Trade Center ) ) ) ( when ( he ( saw ( ( the ( second aircraft ) ) ( strike ( the ( South Tower ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (S (NP (DT The) (NNP Vice) (NNP President)) (VP (VBD was) (VP (VBG wondering) (SBAR (WHADVP (WRB how)) (S (NP (DT the) (NN hell)) (VP (MD could))))))) (NP (DT a) (NN plane)) (VP (VBD hit) (NP (NP (DT the) (NNP World) (NNP Trade) (NNP Center)) (SBAR (WHADVP (WRB when)) (S (NP (PRP he)) (VP (VBD saw) (SBAR (S (NP (DT the) (JJ second) (NN aircraft)) (VP (VBP strike) (NP (DT the) (NNP South) (NNP Tower)))))))))) (. .)))
After the first plane struck, the Vice President knew exactly what had happened.
( ( After ( ( the ( first plane ) ) struck ) ) ( , ( ( the ( Vice President ) ) ( ( knew ( ( exactly what ) ( had happened ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN After) (S (NP (DT the) (JJ first) (NN plane)) (VP (VBD struck)))) (, ,) (NP (DT the) (NNP Vice) (NNP President)) (VP (VBD knew) (SBAR (WHNP (RB exactly) (WP what)) (S (VP (VBD had) (VP (VBN happened)))))) (. .)))