( ( ( The wind ) ( above ( ( the ( ocean pushes ) ) ( on ( the water ) ) ) ) ) ( , ( ( causing ( the ripples ) ) ( , ( ( ( ( swells , ) and ) ( chop ( that ( we ( call waves ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (DT The) (NN wind)) (PP (IN above) (NP (NP (DT the) (NN ocean) (NN pushes)) (PP (IN on) (NP (DT the) (NN water)))))) (, ,) (S (VP (VBG causing) (NP (DT the) (NNS ripples)))) (, ,) (VP (VP (VBZ swells)) (, ,) (CC and) (VP (VB chop) (SBAR (IN that) (S (NP (PRP we)) (VP (VBP call) (NP (NNS waves))))))) (. .)))
The wind above the ocean pushes on the water, causing the ripples, swells, and chop that we call waves.
(ROOT (S (NP (NNP Ocean) (NNS waves)) (VP (VBP are) (ADVP (RB mainly)) (VP (VBN caused) (PP (IN by) (NP (NN wind))))) (. .)))