( ( Heart valves ) ( There ( ( are ( four ( heart valves ) ) ) . ) ) )
(ROOT (S (NP (NNP Heart) (NNS valves)) (ADVP (RB There)) (VP (VBP are) (NP (CD four) (NN heart) (NNS valves))) (. .)))
Heart valves There are four heart valves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))