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