Here is a short summary of English grammar about apostrophes. It is based upon a video by a native english speaker, so I assume it is correct.
- Use an ‘s for singular nouns even if it ends with an s:
- people’s vote
- James’s shoes
- Use an apostrophe without s for possessives of most plural nouns except if the plural does not end in s
- Children’s parents
- waiters’ aprons (no s after the apostroph!)
- the Joneses’ house
- the Simpsons’ house (If their surname is Simpson without s)
- Xerses’ shoes (no s for names related to mythology…)
- Use an Apostrophe with -s When Two or More Nouns Possess the Same Thing but note the difference between:
- Emma and Nicole’s school project (Emma and Nicole worked together on the same project)
- Tim’s and Marty’s ice cream (Each boy has his own ice cream.)
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