They do not know it themselves.'  
( They ( ( ( ( do not ) ( know ( it themselves ) ) ) . ) ' ) )
(ROOT (S (NP (PRP They)) (VP (VBP do) (RB not) (VP (VB know) (S (NP (PRP it)) (NP (PRP themselves))))) (. .) ('' ')))
They did not ask, and so, they do not know.
( ( ( ( ( They ( ( did not ) ask ) ) , ) and ) ( so ( , ( they ( ( do not ) know ) ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBD did) (RB not) (VP (VB ask)))) (, ,) (CC and) (S (ADVP (RB so)) (, ,) (NP (PRP they)) (VP (VBP do) (RB not) (VP (VB know)))) (. .)))