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Both forms (Thomas' and Thomas's) are correct singular possessive nouns.

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: Thomas'

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

Examples:

Dr. Thomas' office is on the second floor.

Dr. Thomas's office is on the second floor.

Use the form that best suits the way you say the word, or if you are a student, the form your teacher prefers.

Either is correct. According to the Oxford English Dictionary, it is perfectly acceptable to place an apostrophe and s after an already existing s in singular nouns.

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Q: When to use Thomas' vs Thomas's?
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