( It ( ( can ( exist ( ( ( as ( ( a liquid ) ( at ( room temperature ) ) ) ) or ) ( as ( a ( solid ( crystal salt ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD can) (VP (VB exist) (PP (PP (IN as) (NP (NP (DT a) (NN liquid)) (PP (IN at) (NP (NN room) (NN temperature))))) (CC or) (PP (IN as) (NP (DT a) (JJ solid) (NN crystal) (NN salt)))))) (. .)))
It can exist as a liquid at room temperature or as a solid crystal salt.
(ROOT (S (NP (JJS Most) (NNS metals)) (VP (VBP exist) (PP (IN as) (NP (NP (NNS solids)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))