( It ( ( ( ( ( ( ( ( ( forms ( solid ( grey crystals ) ) ) ( at ( standard ( ( temperature and ) pressure ) ) ) ) , ) ( is ( highly toxic ) ) ) , ) ( ( reacts violently ) ( with water ) ) ) and ) ( is ( corrosive ( to ( most metals ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VP (VBZ forms) (NP (JJ solid) (JJ grey) (NNS crystals)) (PP (IN at) (NP (JJ standard) (NN temperature) (CC and) (NN pressure)))) (, ,) (VP (VBZ is) (ADJP (RB highly) (JJ toxic))) (, ,) (VP (VBZ reacts) (ADVP (RB violently)) (PP (IN with) (NP (NN water)))) (CC and) (VP (VBZ is) (ADJP (JJ corrosive) (PP (TO to) (NP (JJS most) (NNS metals)))))) (. .)))
It forms solid grey crystals at standard temperature and pressure, is highly toxic, reacts violently with water and is corrosive to most metals.
(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)))))) (. .)))