a sour taste in one 's mouth , 
(ROOT (NP (NP (DT a) (JJ sour) (NN taste)) (PP (IN in) (NP (NP (PRP one) (POS 's)) (NN mouth))) (, ,)))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NP (PRP ) (POS )) (NN ))) (, )))