 Most menu prices include taxes and a service charge, but it's customary to leave a tip if you were served satisfactorily.
( ( ( ( ( ( Most ( menu prices ) ) ( include ( ( taxes and ) ( a ( service charge ) ) ) ) ) , ) but ) ( it ( 's ( customary ( to ( ( leave ( a tip ) ) ( if ( you ( were ( served satisfactorily ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJS Most) (NN menu) (NNS prices)) (VP (VBP include) (NP (NP (NNS taxes)) (CC and) (NP (DT a) (NN service) (NN charge))))) (, ,) (CC but) (S (NP (PRP it)) (VP (VBZ 's) (ADJP (JJ customary) (S (VP (TO to) (VP (VB leave) (NP (DT a) (NN tip)) (SBAR (IN if) (S (NP (PRP you)) (VP (VBD were) (VP (VBN served) (ADVP (RB satisfactorily)))))))))))) (. .)))
Tips are not accepted at most restaurants, as there is already a sales tax.
( Tips ( ( ( are not ) ( ( ( accepted ( at ( most restaurants ) ) ) , ) ( as ( there ( ( is already ) ( a ( sales tax ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Tips)) (VP (VBP are) (RB not) (VP (VBN accepted) (PP (IN at) (NP (JJS most) (NNS restaurants))) (, ,) (SBAR (IN as) (S (NP (EX there)) (VP (VBZ is) (ADVP (RB already)) (NP (DT a) (NNS sales) (NN tax))))))) (. .)))