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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: basis'

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

Example:

The basis' veracity is supported by the number of double blind tests conducted.

The basis's veracity is supported by the number of double blind tests conducted.

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∙ 12y ago

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