It's definitely grown.
( It ( ( ( 's definitely ) grown ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (ADVP (RB definitely)) (VP (VBN grown))) (. .)))
That tree is now 10 feet tall.
( ( That tree ) ( ( ( is now ) ( ( 10 feet ) tall ) ) . ) )
(ROOT (S (NP (DT That) (NN tree)) (VP (VBZ is) (ADVP (RB now)) (ADJP (NP (CD 10) (NNS feet)) (JJ tall))) (. .)))