( RAIN ( ( ( ( = ( liquid ( water drops ) ) ) ( that fall ) ) ( from ( the sky ) ) ) . ) )
(ROOT (S (NP (NNP RAIN)) (VP (VBD =) (NP (JJ liquid) (NN water) (NNS drops)) (NP (DT that) (NN fall)) (PP (IN from) (NP (DT the) (NN sky)))) (. .)))
RAIN= liquid water drops that fall from the sky.
(ROOT (S (NP (NN Rain)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (JJ liquid) (NN water))))) (. .)))