( ( The heart ) ( ( has ( four valves ) ) . ) )
(ROOT (S (NP (DT The) (NN heart)) (VP (VBZ has) (NP (CD four) (NNS valves))) (. .)))
The heart has four valves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))