SECTIONⅡ Parenthesis, negation, and comparison I. Parenthetic clauses (1) in the main clause Nuclear fission it has been claimed will be a cheap, clean and almost inexhaustible source of power. Potential energy, it is true, might not affect the sense of touch in the same way as kinetic energy would (2)in the sub-clause Ohm's law has a few forms which it will be found are very useful.SECTION Ⅱ Parenthesis, negation, and comparison I. Parenthetic clauses (1) in the main clause Nuclear fission, it has been claimed, will be a cheap, clean and almost inexhaustible source of power. Potential energy, it is true, might not affect the sense of touch in the same way as kinetic energy would. (2) in the sub-clause Ohm’s law has a few forms which it will be found are very useful