is always a joy to watch , even when her material is not first-rate 
(ROOT (VP (VBZ is) (ADVP (RB always)) (NP (NP (DT a) (NN joy)) (SBAR (S (VP (TO to) (VP (VB watch)))))) (, ,) (SBAR (ADVP (RB even) (WRB when)) (S (NP (PRP$ her) (NN material)) (VP (VBZ is) (RB not) (ADJP (JJ first) (HYPH -) (NN rate)))))))
(ROOT (VP (VBZ ) (ADVP (RB )) (NP (NP (DT ) (NN )) (SBAR (S (VP (TO ) (VP (VB )))))) (, ) (SBAR (ADVP (RB ) (WRB )) (S (NP (PRP$ ) (NN )) (VP (VBZ ) (RB ) (ADJP (JJ ) (HYPH ) (NN )))))))