When should you use an apostrophe?

When should you use an apostrophe?

You should use an apostrophe in the following situations:

1. To indicate possession: e.g., "John's car" or "the dog's bone."
2. To indicate contraction: e.g., "can't" (short for "cannot") or "it's" (short for "it is").
3. To form plurals of lowercase letters or symbols: e.g., "mind your p's and q's" or "dot your i's and cross your t's."
4. In certain abbreviations or acronyms: e.g., "I'm" (short for "I am") or "let's" (short for "let us").