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)))) (. .)))
I talked his ear off. 
( I ( ( ( talked ( his ear ) ) off ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD talked) (NP (PRP$ his) (NN ear)) (PRT (RP off))) (. .)))