( Sunlight ( ( is ( ( the ( ultimate source ) ) ( of ( most ( of ( ( the energy ) ( we use ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (NN energy)) (SBAR (S (NP (PRP we)) (VP (VBP use)))))))))) (. .)))
Sunlight is the ultimate source of most of the energy we use.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ main) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NNS organisms)) (PP (IN in) (NP (JJS most) (NN food) (NNS chains))))))))))) (. .)))
Sunlight is the main source of energy for all of the organisms in most food chains.