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