( ( Use ( to ( ( describe behavior ) only ) ) ) . )
(ROOT (S (VP (VB Use) (S (VP (TO to) (VP (VB describe) (NP (NN behavior)) (ADVP (RB only)))))) (. .)))
Use to describe behavior only .
(ROOT (S (NP (JJ Learned) (NN behavior)) (VP (VP (VBZ occurs) (ADVP (RB only)) (PP (IN after) (NP (NN experience) (CC or) (NN practice)))) (CC and) (VP (VBZ describes) (NP (RBS most) (JJ human) (NNS behaviors)))) (. .)))