Possessive case guide

Hey, folks.

As I promised, here's an explanation

Names ending in s

Singular

There are two ways of spelling it

How do you estimate Kamala Harris's chances on the following elections?

How do you estimate Kamala Harris' chances on the following elections?

However, they are both acceptable, this is just a matter of stylistic preferences.

Similarly, If the name of place already ends in s, we follow the same rule, so both are correct

Belrus' Council of the Republic is located in Minsk.

Belrus's Council of the Republic is located in Minsk.

Plural

For plural possessives of them, we do always put the apostrophe in the end.

Harrises' family is very proud of her.

The same rule holds for the names of places, that are plural.

A lot of the United States' citizens used mail ballots during the COVID-19 pandemic.

And also:

• Netherlands' baroque musicians
• Philippines' islands

Names ending in x or z

In this case, we follow the common rule, putting 's in the end.

The first volume of Marx's monumental work has more than 1000 pages.

Phoenix's wings

"Mask" is one of my favourite Cameron Diaz's perormance.

TL;DR Singular name of smt ends in s => use either <...>'s or <..s>'.
It is Plural => only <..s>' is ok.

Here we go. Thank you for your attention. Have a nice day.

Cheers