Consider, for example, a 9-month-old infant who has never before seen a jack-in-the-box.
( ( ( ( ( Consider , ) ( for example ) ) , ) ( ( a ( 9-month-old infant ) ) ( who ( ( has never ) ( before ( seen ( a jack-in-the-box ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Consider) (, ,) (PP (IN for) (NP (NN example))) (, ,) (NP (NP (DT a) (JJ 9-month-old) (NN infant)) (SBAR (WHNP (WP who)) (S (VP (VBZ has) (ADVP (RB never)) (VP (ADVP (RB before)) (VBN seen) (NP (DT a) (JJ jack-in-the-box)))))))) (. .)))
Every child older than 6 months has seen a jack-in-the-box before.
( ( ( Every ( child older ) ) ( than ( 6 months ) ) ) ( ( has ( ( seen ( a jack-in-the-box ) ) before ) ) . ) )
(ROOT (S (NP (NP (DT Every) (NN child) (JJR older)) (PP (IN than) (NP (CD 6) (NNS months)))) (VP (VBZ has) (VP (VBN seen) (NP (DT a) (JJ jack-in-the-box)) (ADVP (RB before)))) (. .)))