( ( ( ( ( Particles ( ( ( ( have ( less energy ) ) and ) therefore ) ( ( move ( closer together ) ) ( so ( that ( ( the ( attractive forces ) ) ( become stronger ) ) ) ) ) ) ) , ) and ) ( ( the gas ) ( becomes ( ( ( a liquid ) or ) ( a solid ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Particles)) (VP (VP (VBP have) (NP (JJR less) (NN energy))) (CC and) (ADVP (RB therefore)) (VP (VB move) (ADVP (RBR closer) (RB together)) (SBAR (RB so) (IN that) (S (NP (DT the) (JJ attractive) (NNS forces)) (VP (VBP become) (ADJP (JJR stronger)))))))) (, ,) (CC and) (S (NP (DT the) (NN gas)) (VP (VBZ becomes) (NP (NP (DT a) (NN liquid)) (CC or) (NP (DT a) (JJ solid))))) (. .)))
Particles have less energy and therefore move closer together so that the attractive forces become stronger, and the gas becomes a liquid or a solid.
(ROOT (S (NP (NNP Solid)) (VP (VBZ exists) (SBAR (IN if) (S (NP (NNS particles)) (VP (VBP do) (RB not) (VP (VB have) (NP (ADJP (RB enough) (JJ kinetic)) (NN energy) (S (VP (TO to) (VP (VB overcome) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (PRP them))))))))))))))) (. .)))