Friendly staff.
( Friendly ( staff . ) )
(ROOT (NP (JJ Friendly) (NN staff) (. .)))
The staff is rude to their customers.
( ( The staff ) ( ( is ( rude ( to ( their customers ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN staff)) (VP (VBZ is) (ADJP (JJ rude) (PP (TO to) (NP (PRP$ their) (NNS customers))))) (. .)))