( ( In fact ) ( , ( copper ( ( is ( ( a ( good conductor ) ) ( of electricity ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN fact))) (, ,) (NP (NN copper)) (VP (VBZ is) (NP (NP (DT a) (JJ good) (NN conductor)) (PP (IN of) (NP (NN electricity))))) (. .)))
In fact, copper is a good conductor of electricity.
(ROOT (S (NP (NN Copper)) (VP (VBZ conducts) (NP (NP (NN electricity)) (NP (DT the) (JJS best)))) (. .)))