( ( Use ( the ( kinetic ( theory ( to ( explain ( gas pressure ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Use) (NP (DT the) (JJ kinetic) (NN theory) (S (VP (TO to) (VP (VB explain) (NP (NN gas) (NN pressure))))))) (. .)))
Use the kinetic theory to explain gas pressure.
(ROOT (S (NP (NP (DT The) (NN behavior)) (PP (IN of) (NP (JJ ideal) (NNS gases)))) (VP (VBZ is) (VP (VBN explained) (PP (IN by) (NP (JJ kinetic) (JJ molecular) (NN theory))))) (. .)))
The behavior of ideal gases is explained by kinetic molecular theory.