( Molecules ( ( ( expand ( with ( ( heat and ) contract ) ) ) ( with cold ) ) . ) )
(ROOT (S (NP (NNS Molecules)) (VP (VBP expand) (PP (IN with) (NP (NN heat) (CC and) (NN contract))) (PP (IN with) (NP (NN cold)))) (. .)))
Molecules expand with heat and contract with cold.
(ROOT (S (NP (NP (DT The) (NN liquid)) (PP (IN in) (NP (DT a) (NN thermometer)))) (VP (VP (VBZ expands)) (CC or) (VP (VBZ contracts) (S (VP (TO to) (VP (VB respond) (PP (TO to) (NP (NN heat) (CC or) (NN cold)))))))) (. .)))