" In my opinion, the plural would be incorrect. " I'd say "of my doing" uses "doing" as an uncountable. This is not my doing / These are not my doings.
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ninania"I promise you this was none of my doing."In my opinion, the plural would be incorrect.
ninaniaI noticed that with these it becomes plural. Maybe this is what it depends on?That may be a slight oversimplification, but it's a step in the right direction. While a plural noun is countable, a singular noun can often be both.
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