( ( In ( a ( solid phase ) ) ) ( , ( ( water molecules ) ( ( ( ( are ( relatively inactive ) ) such ) ( that ( ( an ( ice cube ) ) ( ( maintains ( its shape ) ) ( at ( subfreezing temperatures ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (JJ solid) (NN phase))) (, ,) (NP (NN water) (NNS molecules)) (VP (VBP are) (ADJP (RB relatively) (JJ inactive)) (PP (JJ such)) (SBAR (IN that) (S (NP (DT an) (NN ice) (NN cube)) (VP (VBZ maintains) (NP (PRP$ its) (NN shape)) (PP (IN at) (NP (VBG subfreezing) (NNS temperatures))))))) (. .)))
In a solid phase, water molecules are relatively inactive such that an ice cube maintains its shape at subfreezing temperatures.
(ROOT (S (NP (NN Ice) (NNS cubes)) (VP (VBP are) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT the) (JJ solid) (NN form)) (PP (IN of) (NP (NN water))))))) (. .)))
Ice cubes are an example of the solid form of water.