( ( All ( food chains ) ) ( ( begin ( with sunlight ) ) . ) )
(ROOT (S (NP (DT All) (NN food) (NNS chains)) (VP (VBP begin) (PP (IN with) (NP (NN sunlight)))) (. .)))
All food chains begin with sunlight.
(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.