What are the rules to use Apostrophe?

[IELTS-Community]

Apostrophes are used to indicate possession or to show the omission of letters in contractions. Here are the basic rules:

Possession​

• Singular nouns: Add an apostrophe and an "s" to show possession.
  • Example: "The dog's tail"
• Plural nouns ending in "s": Add only an apostrophe.
  • Example: "The boys' toys"
• Plural nouns not ending in "s": Add an apostrophe and an "s."
  • Example: "Men's shoes"

Contractions​

• Omitted letters: Use an apostrophe to show where letters have been omitted.
  • Example: "Can't" (cannot), "Don't" (do not)

Other Uses​

• Plural of letters and numbers: Add an apostrophe and an "s."
  • Example: "The 1990s"
  • Example: "A's and B's"

Note: There are a few exceptions to these rules, but these guidelines cover the most common usage.