Three Common Mistakes with Apostrophes Apostrophes are responsible for some serious writing errors. Here are the three most common mistakes related to apostrophes: (1) To show normal plurals. three cat's (should be "cats") good idea's (should be "ideas") two video's (should be "videos") (2) Randomly before the letter "s."

Apostrophe misuse usually falls into one of the following four categories: (1) Using an apostrophe for a plural. We have a two-for-one offer on banana's. We have a two-for-one offer on bananas. (2) Misplacing a possessive apostrophe. The boys' nose was covered in chocolate. The boy's nose was covered in chocolate.

Here are some phrases where the apostrophe is commonly misused: Do's and don't's ❌ Dos and don'ts ✅ Born in the 90's ❌ Born in the 90s ✅ My collection of CD's ❌ My collection of CDs ✅