's a barely tolerable slog over well-trod ground . 
(ROOT (S (VP (VBZ 's) (NP (NP (DT a) (ADJP (RB barely) (JJ tolerable)) (NN slog)) (PP (IN over) (NP (ADJP (RB well) (HYPH -) (JJ trod)) (NN ground))))) (. .)))
(ROOT (S (VP (VBZ ) (NP (NP (DT ) (ADJP (RB ) (JJ )) (NN )) (PP (IN ) (NP (ADJP (RB ) (HYPH ) (JJ )) (NN ))))) (. )))