( However ( , ( ( the oceans ) ( ( may ( be ( composed ( of ( ( ( liquid methane ) , ) ( ( the rain ) ( ( made up ) ( of ( ( ( drops ( of ( methane ( and ( liquid nitrogen ) ) ) ) ) and ) ( ( the lavas ) ( pouring ( on ( to ( ( the surface ) ( formed ( of ( liquid ( ( water and ) ammonia ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (DT the) (NNS oceans)) (VP (MD may) (VP (VB be) (VP (VBN composed) (PP (IN of) (NP (NP (JJ liquid) (NN methane)) (, ,) (NP (NP (DT the) (NN rain)) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (NP (NNS drops)) (PP (IN of) (NP (NN methane) (CC and) (NN liquid) (NN nitrogen)))) (CC and) (NP (NP (DT the) (NNS lavas)) (VP (VBG pouring) (PP (IN on) (PP (TO to) (NP (NP (DT the) (NN surface)) (VP (VBN formed) (PP (IN of) (NP (JJ liquid) (NN water) (CC and) (NN ammonia)))))))))))))))))) (. .)))
However, the oceans may be composed of liquid methane, the rain made up of drops of methane and liquid nitrogen and the lavas pouring on to the surface formed of liquid water and ammonia.
(ROOT (S (NP (NN Rain)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (JJ liquid) (NN water))))) (. .)))