( ( Some ( of ( ( the manifestations ) ( of ( transient units ) ) ) ) ) ( ( are ( ( ( the ( nature forces ) ) , ) ( such ( as ( ( gravity , ) ( electricity ( , ( magnetism ( , ( and lightning ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Some)) (PP (IN of) (NP (NP (DT the) (NNS manifestations)) (PP (IN of) (NP (JJ transient) (NNS units)))))) (VP (VBP are) (NP (NP (DT the) (NN nature) (NNS forces)) (, ,) (PP (JJ such) (IN as) (NP (NP (NN gravity)) (, ,) (NP (NN electricity) (, ,) (NN magnetism) (, ,) (CC and) (NN lightning)))))) (. .)))
Some of the manifestations of transient units are the nature forces, such as gravity, electricity, magnetism, and lightning.
(ROOT (S (NP (NNP Gravity) (CC and) (NNP magnetism)) (VP (VBP are) (NP (DT both) (JJ common) (NNS forces))) (. .)))
Gravity and magnetism are both common forces.