Obviously, I could not say much.
( Obviously ( , ( I ( ( ( could not ) ( say much ) ) . ) ) ) )
(ROOT (S (ADVP (RB Obviously)) (, ,) (NP (PRP I)) (VP (MD could) (RB not) (VP (VB say) (NP (RB much)))) (. .)))
The topic was new to me, so I couldn't give any details.
( ( ( ( ( ( The topic ) ( was ( new ( to me ) ) ) ) , ) so ) ( I ( ( could n't ) ( give ( any details ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN topic)) (VP (VBD was) (ADJP (JJ new) (PP (TO to) (NP (PRP me)))))) (, ,) (IN so) (S (NP (PRP I)) (VP (MD could) (RB n't) (VP (VB give) (NP (DT any) (NNS details))))) (. .)))