( ( ( ( ( ( ( Conduction ( ( : ( ( Metals ( ( are ( good conductors ) ) ( because ( they ( have ( free electrons ) ) ) ) ) ) . ) ) Silver ) ) and ) copper ) ( are ( ( the ( two ( best conductors ) ) ) ( of heat ) ) ) ) and ) ( ( electricity ( . Lead ) ) ( is ( ( the ( poorest conductor ) ) ( of heat ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NN Conduction) (UCP (: :) (S (NP (NNS Metals)) (VP (VBP are) (NP (JJ good) (NNS conductors)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP have) (NP (JJ free) (NNS electrons))))))) (. .)) (NN Silver)) (CC and) (NP (NN copper))) (VP (VBP are) (NP (NP (DT the) (CD two) (JJS best) (NNS conductors)) (PP (IN of) (NP (NN heat)))))) (CC and) (S (NP (NN electricity) (. .) (NNP Lead)) (VP (VBZ is) (NP (NP (DT the) (JJS poorest) (NN conductor)) (PP (IN of) (NP (NN heat)))))) (. .)))
Conduction : Metals are good conductors because they have free electrons. Silver and copper are the two best conductors of heat and electricity. Lead is the poorest conductor of heat.
(ROOT (S (NP (NN Copper)) (VP (VBZ conducts) (NP (NP (NN electricity)) (NP (DT the) (JJS best)))) (. .)))