( ( Pure substances ) ( ( include ( ( ( ( ( all ( the elements ) ) , ) ( such ( as ( ( ( ( ( hydrogen , ) ( ( gold and ) iron ) ) , ) and ) compounds ) ) ) ) , ) ( such ( as ( water ( and ( carbon dioxide ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Pure) (NNS substances)) (VP (VBP include) (NP (NP (NP (PDT all) (DT the) (NNS elements)) (, ,) (PP (JJ such) (IN as) (NP (NP (NN hydrogen)) (, ,) (NP (NN gold) (CC and) (NN iron)) (, ,) (CC and) (NP (NNS compounds)))) (, ,)) (PP (JJ such) (IN as) (NP (NN water) (CC and) (NN carbon) (NN dioxide))))) (. .)))
Pure substances include all the elements, such as hydrogen, gold and iron, and compounds, such as water and carbon dioxide.
(ROOT (S (NP (NNS Elements)) (VP (VBP are) (NP (NP (JJ pure) (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (VBP make) (ADVP (RB up) (DT all) (NN matter))))))) (. .)))