( ( The Sun ) ( ( ( is mostly ) ( hydrogen plasma ) ) . ) )
(ROOT (S (NP (DT The) (NNP Sun)) (VP (VBZ is) (ADVP (RB mostly)) (NP (NN hydrogen) (NN plasma))) (. .)))
The Sun is mostly hydrogen plasma.
(ROOT (S (NP (DT The) (NN sun)) (ADVP (RB mostly)) (VP (VBD made) (PRT (RP up)) (PP (IN of) (NP (DT the) (NN element) (NN hydrogen)))) (. .)))