. . . [I]f they're there then we'll run on them.
( ... ( ( ( -LSB- ( I ( -RSB- ( f ( they ( ( 're there ) then ) ) ) ) ) ) ( we ( 'll ( run ( on them ) ) ) ) ) . ) )
(ROOT (S (: ...) (S (S (VP (VBG -LSB-) (S (NP (PRP I)) (ADJP (JJ -RSB-)) (SBAR (X (SYM f)) (S (NP (PRP they)) (VP (VBP 're) (ADVP (RB there)) (ADVP (RB then)))))))) (NP (PRP we)) (VP (MD 'll) (VP (VB run) (PP (IN on) (NP (PRP them)))))) (. .)))
They said, "If they are there, then we will run on them" to try to save the crew, passengers or buildings in larger public places from being attacked. 
( They ( ( ( ( said , ) `` ) ( ( If ( they ( are there ) ) ) ( , ( then ( we ( will ( ( ( run on ) ( them '' ) ) ( to ( try ( to ( ( save ( ( ( the crew ) , ) ( ( ( passengers or ) buildings ) ( in ( larger ( public places ) ) ) ) ) ) ( from ( being attacked ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD said) (, ,) (`` ``) (S (SBAR (IN If) (S (NP (PRP they)) (VP (VBP are) (ADVP (RB there))))) (, ,) (ADVP (RB then)) (NP (PRP we)) (VP (MD will) (VP (VB run) (PRT (RP on)) (NP (PRP them) ('' '')) (S (VP (TO to) (VP (VB try) (S (VP (TO to) (VP (VB save) (NP (NP (DT the) (NN crew)) (, ,) (NP (NP (NNS passengers) (CC or) (NNS buildings)) (PP (IN in) (NP (JJR larger) (JJ public) (NNS places))))) (PP (IN from) (S (VP (VBG being) (VP (VBN attacked))))))))))))))) (. .)))