even at its worst , it 's not half-bad . 
(ROOT (S (PP (ADVP (RB even)) (IN at) (NP (PRP$ its) (JJS worst))) (, ,) (NP (PRP it)) (VP (VBZ 's) (RB not) (ADJP (NN half) (HYPH -) (JJ bad))) (. .)))
(ROOT (S (PP (ADVP (RB )) (IN ) (NP (PRP$ ) (JJS ))) (, ) (NP (PRP )) (VP (VBZ ) (RB ) (ADJP (NN ) (HYPH ) (JJ ))) (. )))