( ( ( ( B base ) -- ) ( ( a substance ) ( that ( has ( ( a pH ) ( of ( ( ( more ( than 7 ) ) , ) ( which ( is neutral ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP B) (NN base)) (: --) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (NP (DT a) (NN pH)) (PP (IN of) (NP (NP (QP (JJR more) (IN than) (CD 7))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ neutral)))))))))))) (. .)))
B base --a substance that has a pH of more than 7, which is neutral.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN substance)) (VP (VBZ has) (NP (DT a) (NN ph) (NN value)) (NP (QP (JJR greater) (IN than) (CD 7)))))) (, ,) (NP (DT that)) (VP (VBZ indicates) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ is) (NP (NN base)))))) (. .)))
If a substance has a ph value greater than 7,that indicates that it is base.