they they are good
( they ( they ( are good ) ) )
(ROOT (FRAG (NP (NP (PRP they)) (SBAR (S (NP (PRP they)) (VP (VBP are) (ADJP (JJ good))))))))
They're excellent.
( They ( ( 're excellent ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP 're) (ADJP (JJ excellent))) (. .)))