( It ( ( may ( be ( ( ( ( an ( electric current ) ) ( in ( a ( circular conductor ) ) ) ) or ) ( ( the motion ) ( of ( ( an ( orbiting electron ) ) ( in ( an atom ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD may) (VP (VB be) (NP (NP (NP (DT an) (JJ electric) (NN current)) (PP (IN in) (NP (DT a) (JJ circular) (NN conductor)))) (CC or) (NP (NP (DT the) (NN motion)) (PP (IN of) (NP (NP (DT an) (VBG orbiting) (NN electron)) (PP (IN in) (NP (DT an) (NN atom))))))))) (. .)))
It may be an electric current in a circular conductor or the motion of an orbiting electron in an atom .
(ROOT (S (NP (NP (NNS Atoms)) (PP (IN of) (NP (NNS metals)))) (VP (VBP are) (NP (NP (JJ good) (NNS conductors)) (PP (IN of) (NP (NN electricity)))) (SBAR (IN because) (S (NP (PRP they)) (VP (VB give) (PRT (RP up)) (NP (NNS electrons)))))) (. .)))