( ( The students ) ( ( will ( be ( ( using ( both ( ( ( a ( bar graph ) ) and ) ( a ( circle graph ) ) ) ) ) ( to ( show ( their results ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS students)) (VP (MD will) (VP (VB be) (VP (VBG using) (NP (PDT both) (NP (DT a) (NN bar) (NN graph)) (CC and) (NP (DT a) (NN circle) (NN graph))) (S (VP (TO to) (VP (VB show) (NP (PRP$ their) (NNS results)))))))) (. .)))
The students will be using both a bar graph and a circle graph to show their results.
(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))))))))) (. .)))