the dog's bark-- one dog the dogs' barks-- more than one dog Thomas's dogs-- one Thomas Thomases' dogs-- more than one Thomas Socrates' philosophy-- one Socrates Socrateses' philosophies- more than one Socrates. The point being that modern punctuation prefers the 's after singular nouns-- but not plural nouns-- ending in s , but still recognizes the apostrophe only in certain classical names: Socrates', Moses', Jesus'. Nevertheless, the older way ( Charles' dog) is still eminently understandable, and will be corrected only by the most pedantic.
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