( Mercury ( ( is ( ( the ( ( only liquid ) metal ) ) ( at ( room temperature ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RB only) (JJ liquid)) (NN metal)) (PP (IN at) (NP (NN room) (NN temperature))))) (. .)))
Mercury is the only liquid metal at room temperature.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (RB not) (NP (DT a) (JJ solid) (ADJP (RB even) (PP (IN at) (NP (NN room)))) (NN temperature))) (. .)))