The controller continued to try to contact United 93, and asked whether the pilot could confirm that he had been hijacked.
( ( The controller ) ( ( ( ( ( continued ( to ( try ( to ( contact ( United 93 ) ) ) ) ) ) , ) and ) ( asked ( whether ( ( the pilot ) ( could ( confirm ( that ( he ( had ( been hijacked ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN controller)) (VP (VP (VBD continued) (S (VP (TO to) (VP (VB try) (S (VP (TO to) (VP (VB contact) (NP (NNP United) (CD 93))))))))) (, ,) (CC and) (VP (VBD asked) (SBAR (IN whether) (S (NP (DT the) (NN pilot)) (VP (MD could) (VP (VB confirm) (SBAR (IN that) (S (NP (PRP he)) (VP (VBD had) (VP (VBN been) (VP (VBN hijacked)))))))))))) (. .)))
Attempting to get in touch with United 93 continuously, the controller questioned the pilot about hijacking.
( ( Attempting ( to ( ( get ( in ( touch ( with ( United 93 ) ) ) ) ) continuously ) ) ) ( , ( ( the controller ) ( ( ( questioned ( the pilot ) ) ( about hijacking ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Attempting) (S (VP (TO to) (VP (VB get) (PP (IN in) (NP (NP (NN touch)) (PP (IN with) (NP (NNP United) (CD 93))))) (ADVP (RB continuously))))))) (, ,) (NP (DT the) (NN controller)) (VP (VBD questioned) (NP (DT the) (NN pilot)) (PP (IN about) (NP (NN hijacking)))) (. .)))