( ( All metals ) ( ( are ( solid ( except ( ( mercury , ) ( which ( is ( liquid ( at ( room temperature ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT All) (NNS metals)) (VP (VBP are) (ADJP (JJ solid) (PP (IN except) (NP (NP (NN mercury)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ liquid) (PP (IN at) (NP (NN room) (NN temperature))))))))))) (. .)))
All metals are solid except mercury, which is liquid 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))) (. .)))