( they ( merely ( ( ( convert it ) ( from ( ( light energy ) ( to ( chemical energy ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP they)) (ADVP (RB merely)) (VP (VBP convert) (NP (PRP it)) (PP (IN from) (NP (NP (JJ light) (NN energy)) (PP (TO to) (NP (NN chemical) (NN energy)))))) (. .)))
they merely convert it from light energy to chemical energy.
(ROOT (S (S (NP (DT The) (NN energy)) (VP (VBZ transformations) (SBAR (IN that) (S (VP (VBP occur) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN candle) (NNS burns)) (VP (VBZ is) (VP (VBN described) (PP (IN by))))))))))) (: :) (S (NP (NP (NN chemical) (NN energy)) (PP (IN from) (NP (DT the) (NN wax)))) (VP (VBZ is) (VP (VBN converted) (PP (IN into) (NP (NN light) (CC and) (NN heat) (NN energy)))))) (. .)))