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If the singular noun ends in ‑s, -ss, -sh, -ch, -x, or -z, add ‑es to the end to make it plural. ...
In some cases, singular nouns ending in -s or -z, require that you double the -s or -z prior to adding the -es for pluralization.
We got our cats' beds from the store.
Here, the noun "cats'" is neither the subject (which is "we") nor the object (which is "beds"). Instead, "cats'" is a plural possessive noun, showing that the object of the sentence belongs to one particular group. The beds belong to the cats.
***Most English plurals end in S. If that's the case, to make the plural noun possessive, simply add an apostrophe. Going back to the cats' beds, we start with the singular noun cat, then pluralize it to cats, then make it possessive as cats'. Here are a few more examples:
Treats belonging to dogs - Dogs' treats
Management of the many stores - Stores' management
Decision of the executives - Executives' decision
Examples:
a woman's hat
the boss's wife
Mrs. Chang's house