Apostrophes are used for showing possession and short form. They are not used to show plurals.
- Greta’s book.
(Greta has a book.)
- The dog’s bowl.
(The dog has a bowl.)
Showing short form:
(it’s, can’t, haven’t, etc.)
- It’s my car.
(It is my car.)
- I haven’t been to Indonesia yet.
(I have not been to Indonesia yet.)
Plurals don’t have apostrophes:
Cat’s, Dog’s, Orange’s, ABC’s.
- Cats, Dogs, Oranges, ABCs.
Showing the possessive form of nouns and plural nouns that end with -s:
- The actress’ best film.
(The actress has a best film.)
- The cars’ big wheels.
(Many cars have big wheels.)
- The heroes’ problems.
(Many heroes have problems.)
Also, no apostrophes with possessive adjectives: my, your, his, her, its, our, their.
Shall we take your’s or their’s?
- Shall we take yours or theirs?
Our hotel room is next to their’s hotel room.
- Our hotel room is next to theirs.