( ( Some ( of ( the ( subsequent laws ) ) ) ) ( ( are ( explained ( by association ) ) ) . ) )
(ROOT (S (NP (NP (DT Some)) (PP (IN of) (NP (DT the) (JJ subsequent) (NNS laws)))) (VP (VBP are) (VP (VBN explained) (PP (IN by) (NP (NN association))))) (. .)))
Some of the subsequent laws are explained by association.
(ROOT (S (NP (NP (NNP Archimedes) (POS ')) (NN law)) (VP (VBZ explains) (NP (SBAR (WHADVP (WRB why)) (S (NP (DT some) (NNS objects)) (VP (VBP float)))) (CC and) (NP (DT some) (NN sink))))))