( ( If ( ( a consumer ) ( refuses ( to ( carry food ) ) ) ) ) ( , ( ( the group ) ( ( will stop ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN consumer)) (VP (VBZ refuses) (S (VP (TO to) (VP (VB carry) (NP (NN food)))))))) (, ,) (NP (DT the) (NN group)) (VP (MD will) (VP (VB stop))) (. .)))
If a consumer refuses to carry food, the group will stop.
(ROOT (S (NP (NNP Food) (NNS chains)) (VP (VBP carry) (NP (NN energy)) (PP (IN from) (NP (NP (NNS producers)) (PP (TO to) (NP (NNS consumers)))))) (. .)))