( ( In ( the ( line graph ) ) ) ( , ( ( the ( ( points and ) lines ) ) ( ( are ( ( drawn ( on ( ( a grid ) ( in order ) ) ) ) ( to ( ( show change ) ( over ( a ( time period ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (NN line) (NN graph))) (, ,) (NP (DT the) (NNS points) (CC and) (NNS lines)) (VP (VBP are) (VP (VBN drawn) (PP (IN on) (NP (NP (DT a) (NN grid)) (PP (IN in) (NP (NN order))))) (S (VP (TO to) (VP (VB show) (NP (NN change)) (PP (IN over) (NP (DT a) (NN time) (NN period)))))))) (. .)))
In the line graph, the points and lines are drawn on a grid in order to show change over a time period.
(ROOT (S (NP (NNP Line) (NNS graphs)) (VP (VBP are) (ADJP (RB especially) (JJ useful) (PP (IN for) (S (VP (VBG showing) (NP (NNS changes)) (PP (IN over) (NP (NN time)))))))) (. .)))