( ( ( This type ) ( of graph ) ) ( ( is ( useful ( for ( ( ( showing `` ) trends ) '' ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (NN type)) (PP (IN of) (NP (NN graph)))) (VP (VBZ is) (ADJP (JJ useful) (PP (IN for) (S (VP (VBG showing) (`` ``) (NP (NNS trends)) ('' '')))))) (. .)))
This type of graph is useful for showing &quot;trends&quot;.
(ROOT (S (NP (NNP Circle) (NNS graphs)) (VP (VBP are) (ADJP (JJ useful) (PP (IN for) (S (VP (VBG showing) (NP (NP (NNS percents)) (PP (IN of) (NP (DT a) (NN whole))))))))) (. .)))