1 and 3 are correct. 2 is not correct.
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Persian LearnerAll correct?Only 3) is clearly correct. Though some accept "and nor", I don't. To me "nor" between clauses means "and ... not", so "and nor" means "and and ... not". Therefore I would judge 1) as incorrect. 2) is clearly wrong. It contains no clause-initial negative to justify the subject-verb inversion.
Persian LearnerHow about this one?Tom wouldn’t forgive Jenny if she told everyone his secret, nor would I. 100% correct?Yes. 100%
fivejedjonNo. There's a comma splice there, in my opinion."Nor" is a coordinating conjunction. So there is no comma splice.