( ( This ( circle graph ) ) ( ( ( shows ( ( the percent ) ( of ( ( females and ) males ) ) ) ) ( in ( a class ) ) ) . ) )
(ROOT (S (NP (DT This) (NN circle) (NN graph)) (VP (VBZ shows) (NP (NP (DT the) (NN percent)) (PP (IN of) (NP (NNS females) (CC and) (NNS males)))) (PP (IN in) (NP (DT a) (NN class)))) (. .)))
This circle graph shows the percent of females and males in a class.
(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))))))))) (. .)))