And that's why I'm writing to you today.
( And ( that ( ( 's ( why ( I ( 'm ( ( writing ( to you ) ) today ) ) ) ) ) . ) ) )
(ROOT (S (CC And) (NP (DT that)) (VP (VBZ 's) (SBAR (WHADVP (WRB why)) (S (NP (PRP I)) (VP (VBP 'm) (VP (VBG writing) (PP (TO to) (NP (PRP you))) (NP (NN today))))))) (. .)))
I wanted you to understand the urgency of this letter.
( I ( ( wanted ( you ( to ( understand ( ( the urgency ) ( of ( this letter ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD wanted) (S (NP (PRP you)) (VP (TO to) (VP (VB understand) (NP (NP (DT the) (NN urgency)) (PP (IN of) (NP (DT this) (NN letter)))))))) (. .)))