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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: Jacobs'

Add an apostrophe s ('s) after the existing s at the end of the word: Jacobs's

Examples:

Ms. Jacobs' classroom is at the top of the stairs.

Ms. Jacobs's classroom is at the top of the stairs.

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10y ago

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