( Mercury ( ( is ( ( the ( only metal ) ) ( that ( is ( in ( ( liquid form ) ( at ( room temperature ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (PP (IN in) (NP (NP (JJ liquid) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))))))) (. .)))
Mercury is the only metal that is in liquid form 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))) (. .)))