i simply ca n't recommend it enough . 
(ROOT (S (NP (PRP i)) (ADVP (RB simply)) (VP (MD ca) (RB n't) (VP (VB recommend) (NP (PRP it)) (ADVP (RB enough)))) (. .)))
(ROOT (S (NP (PRP )) (ADVP (RB )) (VP (MD ) (RB ) (VP (VB ) (NP (PRP )) (ADVP (RB )))) (. )))