Here's why:
* Apostrophes indicate possession: They show that something belongs to someone or something. For example: "the cat's toy" means the toy belongs to the cat.
* Plurals are formed by adding -s or -es: For example: "cats," "boxes," "babies."
It's easy to get confused because some words use an apostrophe to form a plural:
* Letters: "a's" (multiple instances of the letter "a"), "p's and q's" (referring to the letters)
* Numbers: "1990s" (referring to the decade), "the 1900s" (referring to the 1900s decade)
However, these are special cases and don't apply to regular nouns.
Let me know if you have any more questions about apostrophes or plural forms!