( ( A liquid ) ( ( ( becomes ( a solid ) ) ( if ( ( its temperature ) decreases ) ) ) . ) )
(ROOT (S (NP (DT A) (NN liquid)) (VP (VBZ becomes) (NP (DT a) (JJ solid)) (SBAR (IN if) (S (NP (PRP$ its) (NN temperature)) (VP (VBZ decreases))))) (. .)))
A liquid becomes a solid if its temperature decreases.
(ROOT (S (NP (NP (CD One) (NN way)) (SBAR (S (VP (TO to) (VP (VB change) (NP (NN water)) (PP (IN from) (NP (NP (DT a) (NN liquid)) (PP (TO to) (NP (DT a) (JJ solid)))))))))) (VP (VBZ is) (S (VP (TO to) (VP (VB decrease) (NP (DT the) (NN temperature)))))) (. .)))