• With singular names ending in -s, some people use 's and some people just add an apostrophe.They are both correct, although using 's is more common.
✓ The report is on Charles's computer in the office.
✓ The report is on Charles' computer in the office.
• With plural names ending in -s, we just add an apostrophe, as with other plurals.
✓ The Smiths' business eventually closed down.
• With phrases, the possessive 's and s' must go at the end of the whole phrase.
✓ Tom, Dick and Harry's office is around here somewhere.
✘ Tom's, Dick's and Harry's office is around here somewhere.
✓ The President of France's visit to England will be good for business.
✘ The President's of France visit to England will be good for business.
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