( ( A ( normal heart ) ) ( ( has ( four chambers ) ) . ) )
(ROOT (S (NP (DT A) (JJ normal) (NN heart)) (VP (VBZ has) (NP (CD four) (NNS chambers))) (. .)))
A normal heart has four chambers.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS chambers)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))