use an apostrophe when writing about someone that has possession of something
An apostrophe is used to indicate possession in English when writing about someone who has ownership or possession of something. This is commonly known as the possessive case.
Here are some examples:
1. Susan's car is parked outside.
(The car belongs to Susan)
2. John's house is being renovated.
(The house belongs to John)
3. The cat's bowl is empty.
(The bowl belongs to the cat)
4. My friend's phone was stolen.
(The phone belongs to my friend)
In all of these examples, the apostrophe indicates that the noun following it possesses or owns something.