sentence1_binary_parse: ( Stars ( ( are ( classified ( by ( their ( surface temperature ) ) ) ) ) . ) )
sentence1_parse: (ROOT (S (NP (NNP Stars)) (VP (VBP are) (VP (VBN classified) (PP (IN by) (NP (PRP$ their) (NN surface) (NN temperature))))) (. .)))
sentence1: Stars are classified by their surface temperature.
sentence2_parse: (ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (NN star))))) (. .)))
sentence2: The sun is classified as a star.