. . . [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." 
( They ( ( ( ( ( said , ) `` ) ( ( If ( they ( are there ) ) ) ( , ( then ( we ( will ( run ( on them ) ) ) ) ) ) ) ) . ) '' ) )
(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) (PP (IN on) (NP (PRP them))))))) (. .) ('' '')))