( ( As ( ( an oxide ) ( of hydrogen ) ) ) ( , ( water ( ( is ( formed ( when ( ( hydrogen ( or ( hydrogen-containing compounds ) ) ) ( ( ( burn or ) react ) ( with ( oxygen ( or ( oxygen-containing compounds ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (NP (DT an) (NN oxide)) (PP (IN of) (NP (NN hydrogen))))) (, ,) (NP (NN water)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (NN hydrogen) (CC or) (NN hydrogen-containing) (NNS compounds)) (VP (VBP burn) (CC or) (VBP react) (PP (IN with) (NP (NN oxygen) (CC or) (NN oxygen-containing) (NNS compounds)))))))) (. .)))
As an oxide of hydrogen, water is formed when hydrogen or hydrogen-containing compounds burn or react with oxygen or oxygen-containing compounds.
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (NP (NP (DT an) (NN oxide)) (PP (IN of) (NP (NN hydrogen))))) (. .)))