Possessive vs Contraction: The Apostrophe Problem

📌 Quick Answer

Learn the apostrophe patterns behind its vs it's, your vs you're, whose vs who's, and their vs they're with rules and examples.

How to use this guide: Start with the linked sub-guides that match your confusion first, especially Its vs It's, Your vs You're, Whose vs Who's.

Start with Its vs It's, then work through Your vs You're, Their/There/They're, and Whose vs Who's.

The Possessive vs Contraction Problem

This is the single most common category of grammar mistake in English. The confusion is simple: possessive pronouns (its, your, their, whose) look almost identical to contractions (it's, you're, they're, who's). One has an apostrophe, the other doesn't — and choosing wrong is instantly noticeable.

The universal rule is straightforward: possessive pronouns never use apostrophes. The apostrophe always signals a contraction (a shortened form of two words). "It's" = "it is." "Its" = belonging to it. That's the entire rule — but applying it consistently under time pressure is where most writers fail.

The Four Core Pairs

Pair	Possessive (no apostrophe)	Contraction (apostrophe)	Quick Test
Its vs It's	Its = belonging to it	It's = it is / it has	Replace with "it is." Works? Use it's.
Your vs You're	Your = belonging to you	You're = you are	Replace with "you are." Works? Use you're.
Their / There / They're	Their = belonging to them	They're = they are	Replace with "they are." Works? Use they're.
Whose vs Who's	Whose = belonging to whom	Who's = who is / who has	Replace with "who is." Works? Use who's.

The One Rule That Solves Them All

Every pair follows the same pattern. When you see an apostrophe in a pronoun, it always means the word is a contraction. To test: expand the contraction. If "it is," "you are," "they are," or "who is" makes sense in the sentence, use the apostrophe version. If not, use the possessive.

This rule has zero exceptions in English. Once you internalize it, you'll catch these errors instantly — in your own writing and others'. For related guides, see Apostrophe Rules and Exact Homophones Guide.