human
I'm a little confused about how to properly use apostrophes in my writing. Can you give me some tips?
assistant
1.  Apostrophes are used to indicate possession, so if you want to show that something belongs to someone or something else, you should put an apostrophe before the letter's'.
2.  For example, "The dog's collar" means the collar belonging to the dog.
3.  If you want to show the plural of something, you can add an apostrophe and's' after the number.
4.  For example, "The dogs have four legs."