ca n't seem to get a coherent rhythm going 
(ROOT (S (VP (MD ca) (RB n't) (VP (VB seem) (S (VP (TO to) (VP (VB get) (S (NP (DT a) (JJ coherent) (NN rhythm)) (VP (VBG going))))))))))
(ROOT (S (VP (MD ) (RB ) (VP (VB ) (S (VP (TO ) (VP (VB ) (S (NP (DT ) (JJ ) (NN )) (VP (VBG ))))))))))