( ( if ( solid ( at ( room temperature ) ) ) ) ( , ( shortening . ) ) )
(ROOT (S (SBAR (IN if) (S (ADJP (JJ solid)) (PP (IN at) (NP (NN room) (NN temperature))))) (, ,) (VP (VBN shortening)) (. .)))
if solid at room temperature, shortening.
(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)))))) (. .)))