I am pleased to tell you that we have had a positive response to the letter.
( I ( ( am ( pleased ( to ( ( tell you ) ( that ( we ( have ( ( had ( a ( positive response ) ) ) ( to ( the letter ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (ADJP (JJ pleased) (S (VP (TO to) (VP (VB tell) (NP (PRP you)) (SBAR (IN that) (S (NP (PRP we)) (VP (VBP have) (VP (VBN had) (NP (DT a) (JJ positive) (NN response)) (PP (TO to) (NP (DT the) (NN letter)))))))))))) (. .)))
We have had a really negative response to the letter. 
( We ( ( have ( had ( ( a ( ( really negative ) response ) ) ( to ( the letter ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP have) (VP (VBN had) (NP (NP (DT a) (ADJP (RB really) (JJ negative)) (NN response)) (PP (TO to) (NP (DT the) (NN letter)))))) (. .)))