nevertheless , it still seems endless . 
(ROOT (S (ADVP (RB nevertheless)) (, ,) (NP (PRP it)) (ADVP (RB still)) (VP (VBZ seems) (S (ADJP (JJ endless)))) (. .)))
(ROOT (S (ADVP (RB )) (, ) (NP (PRP )) (ADVP (RB )) (VP (VBZ ) (S (ADJP (JJ )))) (. )))