( ( pHs ( of ( less ( than 7 ) ) ) ) ( ( ( ( indicate acidity ) , ) ( whereas ( ( ( a pH ) ( of ( greater ( than 7 ) ) ) ) ( indicates ( a base ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN pHs)) (PP (IN of) (NP (QP (JJR less) (IN than) (CD 7))))) (VP (VBP indicate) (ADVP (RB acidity)) (, ,) (SBAR (IN whereas) (S (NP (NP (DT a) (NN pH)) (PP (IN of) (NP (QP (JJR greater) (IN than) (CD 7))))) (VP (VBZ indicates) (NP (DT a) (NN base)))))) (. .)))
pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
(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.