Be of good cheer,
( Be ( ( of ( good cheer ) ) , ) )
(ROOT (VP (VB Be) (PP (IN of) (NP (JJ good) (NN cheer)) (, ,))))
Be in a bad mood.
( ( Be ( in ( a ( bad mood ) ) ) ) . )
(ROOT (S (VP (VB Be) (PP (IN in) (NP (DT a) (JJ bad) (NN mood)))) (. .)))