( There ( ( may ( be ( lessons ( to ( be ( learned ( from ( past experience ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (MD may) (VP (VB be) (NP (NNS lessons) (S (VP (TO to) (VP (VB be) (VP (VBN learned) (PP (IN from) (NP (JJ past) (NN experience)))))))))) (. .)))
There may be lessons to be learned from past experience.
(ROOT (S (NP (NNP Insight) (NNP learning)) (VP (VBZ is) (VP (VBN done) (PP (IN from) (NP (JJ past) (NNS experiences) (CC and) (NN reasoning))))) (. .)))