( base ( ( is ( ( a substance ) ( with ( pH ( greater ( than 7 ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN base)) (VP (VBZ is) (NP (NP (DT a) (NN substance)) (PP (IN with) (NP (NN pH) (QP (JJR greater) (IN than) (CD 7)))))) (. .)))
base is a substance with pH greater than 7.
(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.