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In possessive plurals, if the word is already a plural, then 's is added: for example, the children's books. If the word requires an s to make it plural, then the apostrophe goes after the s, e.g. the leaves of many trees becomes the trees' leaves, but if only one tree is involved, then it's the tree's leaves. No apostrophe is required if the word is simply a plural, and not possessive, e.g. more than one cat is many cats, not cat's. The decade of the 1940s is not 1940's.

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16y ago

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