( ( ( ( Classify samples ) ( of matter ) ) ( as ( ( ( ( ( ( ( ( ( ( pure substances ) , ) ( homogeneous mixtures ) ) , ) ( heterogeneous mixtures ) ) , ) compounds ) , ) and ) elements ) ) ) . )
(ROOT (NP (NP (JJ Classify) (NNS samples)) (PP (IN of) (NP (NN matter))) (PP (IN as) (NP (NP (JJ pure) (NNS substances)) (, ,) (NP (JJ homogeneous) (NNS mixtures)) (, ,) (NP (JJ heterogeneous) (NNS mixtures)) (, ,) (NP (NNS compounds)) (, ,) (CC and) (NP (NNS elements)))) (. .)))
Classify samples of matter as pure substances , homogeneous mixtures , heterogeneous mixtures , compounds , and elements .
(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))))))) (. .)))