( ( On examination ) ( , ( ( ( ( the knee ) and ) ( ankle ( jerk reflexes ) ) ) ( ( were hypoactive ) . ) ) ) )
(ROOT (S (PP (IN On) (NP (NN examination))) (, ,) (NP (NP (DT the) (NN knee)) (CC and) (NP (JJ ankle) (NN jerk) (NNS reflexes))) (VP (VBD were) (ADJP (JJ hypoactive))) (. .)))
On examination, the knee and ankle jerk reflexes were hypoactive.
(ROOT (X (NP (DT The) (`` ``) (JJ knee-jerk) ('' '') (NN motion)) (SBAR (IN that) (S (NP (NNS people)) (ADVP (RB involuntarily)) (VP (VBP perform) (SBAR (IN after) (S (S (VP (VBG being) (VP (VBN struck) (PP (IN in) (NP (NP (DT the) (NN knee)) (PP (IN in) (NP (DT a) (JJ certain) (NN way)))))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ reflex))))))))))))