A possessive form of a word is one that shows ownership, origin or a relationship tie.
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In English most possessives are shown by "apostrophe s". Examples are
- Carol's bike
- New York's skyline (some people say it's better to show the relationship of objects by spelling it out like "skyline of New York")
- Mike's sister-in-law
These could all be written out in other ways, such as
- the bike owned by Carol
- the skyline of New York
- the sister-in-law of Mike
There is some debate about whether to have the s at the end when the base word ends in s. Should it be Tess's shoulder or Tess' shoulder? There are arguments and grammarians who believe each option.