A martini should be gin and vermouth and a twist.
( ( A martini ) ( ( should ( be ( ( ( ( gin and ) vermouth ) and ) ( a twist ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN martini)) (VP (MD should) (VP (VB be) (NP (NP (NN gin) (CC and) (NN vermouth)) (CC and) (NP (DT a) (NN twist))))) (. .)))
A martini must be composed by gin and vermouth.
( ( A martini ) ( ( must ( be ( composed ( by ( ( gin and ) vermouth ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN martini)) (VP (MD must) (VP (VB be) (VP (VBN composed) (PP (IN by) (NP (NN gin) (CC and) (NN vermouth)))))) (. .)))