I feel like I'm letting them down, so to, so to speak.
( I ( ( ( ( feel ( like ( I ( 'm ( ( ( ( ( letting them ) down ) , ) so ) to ) ) ) ) ) , ) ( so ( to speak ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP feel) (SBAR (IN like) (S (NP (PRP I)) (VP (VBP 'm) (VP (VP (VBG letting) (NP (PRP them)) (PRT (RP down))) (, ,) (ADVP (RB so)) (VP (TO to)))))) (, ,) (S (RB so) (VP (TO to) (VP (VB speak))))) (. .)))
I know that they are very pleased with me. 
( I ( ( know ( that ( they ( are ( very ( pleased ( with me ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP know) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP are) (ADJP (RB very) (JJ pleased) (PP (IN with) (NP (PRP me)))))))) (. .)))