Its/It's, Their/There, Your/You're, Then/Than

You read the sentence back and it sounds completely fine — and then the red pen finds it anyway. A pink circle round it's, changed to its. A squiggly blue line under their that looked perfectly innocent when you sounded it out. Or you're forty seconds from sending an email to a client and you freeze over "Please find the report in it's folder" — is that right? You honestly can't tell, so you guess, and you hit send.

Here's the thing. This is not a sign that you're bad at spelling, or careless, or that everyone else got a memo you missed. Nobody's born knowing this. You've simply walked into a homophone trap — words that sound the same (or near enough) but do completely different jobs on the page. And the trouble is your ear can't help you here. When the voice in your head reads your and you're, it reads them identically — so your eye glides straight over the wrong one, every time, unless you make it stop.

This isn't a lesson that re-teaches every rule from scratch — the earlier pillars already did that groundwork, and I'll point you home to them at the end. This is the clinic. You've arrived with the symptom — a marked-up draft, a grammar-checker squiggle, that quiet "is this right?" wobble — and we're going to name it, run a fast test, fix it, and leave you with a habit you can run yourself in under three seconds next time.

Before you read on, here's where we're heading. By the end of this article, you'll be able to: - Spot the classic sound-alike pairs the moment they turn up — in homework, a story, an email, a CV [US: resume]. - Run a substitute-and-check test on its/it's, their/there/they're, your/you're, and then/than in seconds. - Fix each trap with a clear wrong-vs-right example — without rewriting the whole paragraph. - Know exactly which pillar to visit if you want the full "why" behind any pair.

Beginner (Foundation): Name the trap, run the first test

Let's start with the feeling you already know. You write "The dog wagged it's tail" and it looks plausible — done, even, because the apostrophe makes it feel finished. But sound-alikes are sneaky precisely because they sound finished. The whole trick, at every level, is the same shape: pause on the little word, swap in a longer phrase that only works for one spelling, and keep the version that still makes sense. That's it. Four swaps, and you're most of the way home.

Its vs it's — say "it is" where the apostrophe sits. This is the one that gets marked most, so start here. When you see it's with an apostrophe, ask out loud: could I say it is (or it has) in that exact spot?

• The cat licked it's paw. → The cat licked it is paw. Nonsense. So lose the apostrophe: The cat licked its paw.
• It's raining again. → It is raining again. Works. Keep it.

No apostrophe means it belongs to it — its, like his and hers, which don't take one either. That's the whole beginner move. The deeper why-does-English-do-this lives in Pillar 2; here we only own catching it.

Your vs you're — same logic, swap in "you are." Identical machinery.

• Your going to be late. → You are going to be late. Works. Use you're.
• Is this you're pencil? → Is this you are pencil? Nonsense. Use your.

Their / there / they're — three spellings, three jobs. All three sound like thair, which is why they're the classic pile-up. Take them one at a time:

• They're → swap in they are. Their late again → They are late again works → They're late again.
• There → a place, or "there is/are." Here's the memory hook that sticks: "there" has "here" hidden inside it — both are about location. That's your r for real place anchor. Their is a spider in the sink → There is a spider…
• Their → belonging to them, and nothing else. Put you're bag over their → Put your bag over there.

Then vs than — time or comparison. These two aren't perfect homophones — some accents keep them quite distinct — but they blur in fast writing, and the fix is delightfully simple. Then is about time or what happens next. Than is about comparison — and there's almost always a giveaway word nearby: more, less, better, worse, taller, rather.

• We had lunch, then we had PE. (Sequence.) Then.
• She's taller then me. → a comparison — taller gives it away → She's taller than me.

Quick recap: - Homophones sound identical; only meaning — plus a quick swap — picks the spelling. - It's → try it is/it has; they're → they are; you're → you are. - There hides here (a place); their is ownership. - Then is time; than is comparison — a more/less/better word nearby means than.

Intermediate (Development): Build the catching habit

Here's the honest bit — you probably knew most of those tests already. The trouble was never knowing them. It's running them, at 4:55 on a Friday, or in the last ten minutes of an exam, when your brain is busy with meaning and your hand is auto-completing the little words from sound. So the intermediate skill isn't more rules. It's the habit of a second, targeted pass — because your normal proofread, the one where you read for sense and flow, sails straight past these.

Do a sound-alike sweep. When you've finished anything that matters — a story, an essay, a report, a message to a client — take thirty seconds and hunt only for the four pairs. Don't re-read for meaning; let your eye bounce along looking for the shapes: its/it's, there/their/they're, your/you're, then/than. When you land on one, run the swap. That's the whole routine.

Watch it work on a sentence that's carrying three traps at once — the sort of thing that lands in a group chat or a rushed draft:

"Your going to love there new game more then the last one."

• Your → you are going to love → works → You're.
• there → place, or ownership? It's whose game → their.
• then → there's more sitting right beside it → comparison → than.

Fixed: "You're going to love their new game more than the last one." Same sentence, and now it doesn't wince.

The tests scale from the classroom to the office without changing a bit. A science exit ticket — "Metals are better conductors then plastics" — trips on better, so it wants than. A line on a CV — "Delivered more impact then the previous year" — same tell, same fix. And a client email — "Their welcome to sign by Friday" — needs you are or they are depending on who you're writing to, but never there, which can't carry either.

Common Mistake: Treating it's like an ordinary possessive apostrophe. You reason "the cat's paw means of the cat, so it's paw means of it" — and English does the exact opposite. Possession is its, no apostrophe. If that feels unfair, you're not wrong — it's a genuine quirk. But swap in it is and the quirk turns into a tool.

Common Mistake: Trusting spellcheck to save you. It usually won't — both spellings are real words, so their, there, then and your all sail through clean. The software can spell; it can't read your mind about which meaning you wanted. That decision stays yours.

Pro-Tip: In a timed exam or a long document, don't re-read everything. Mark suspect lines with a tiny pencil dot — or hit Ctrl-F [Cmd-F on a Mac] and search "its", "there", "your", "then" one at a time. Spend your last two minutes only on the hits. It's the highest-value minute in the whole edit.

Quick recap: - Your normal read-for-sense pass skips these; you need a deliberate second sweep. - Hunt for the four pairs specifically, then run the swap on each hit. - A comparison word nearby (better, more, rather) almost always means than, not then. - Match your care to the stakes — a text to a mate, no; an application, yes.

Advanced (Mastery): Edge cases, register, and knowing when it's not an error

At this level you use exactly the same swaps — but you also catch the sentences that look fine and aren't, widen your net for the sneaky ones, and, just as importantly, know when a supposed "error" is really a choice.

Reading aloud won't catch these — and here's why that matters. Reading your work aloud is a wonderful habit; it exposes clumsy rhythm, missing words, accidental sarcasm. But it is nearly useless for your versus you're, because — by definition — they sound the same. So keep the two jobs separate: substitution for the sound-alikes; reading aloud for the cadence. If your only test is "it sounded fine," these traps will keep slipping through to the final draft.

The than family is bigger than more/less/better. Once you're confident, watch for the quieter comparisons: rather than, other than, no sooner… than, and comparatives like higher than expected or sooner than planned. A useful check — if you could rephrase it as compared with or in preference to, you want than.

• I'd rather finish then go out → that's a preference, not a sequence → I'd rather finish than go out.
• No sooner had we sat down then the bell went → the fixed pattern is no sooner… than**.

Whose / who's rides along with its/it's. Same clinic move, so it's worth having in your pocket: who's expands to who is or who has; whose shows ownership. "The author who's book won" → run who is → it fails → whose. The deep rule for this pair lives with its/it's over in Pillar 2; your job here is just the expansion test.

And sometimes it isn't a mistake at all. Let's be honest — plenty of supposed errors are really register, dialect, or house style, and it's worth naming that honestly rather than tutting.

• Texting a friend "your welcome" won't end the friendship. It's still wrong for schoolwork, exams, and a job application — but the stakes genuinely differ, and pretending otherwise is just pomposity.
• In fiction, a writer might give a character they're for there on purpose, to show how they talk. That's a deliberate choice, not a slip — don't "correct" a voice the author built.
• A publisher's or employer's style guide may ban contractions in formal documents. There, you'd expand it's to it is even when the apostrophe was perfectly correct. That's style compliance, not a homophone fail.
• And correcting a colleague's your/you're in a friendly Slack message, where the stakes are zero? Technically right, socially tin-eared. Save the clinic energy for writing that faces clients, examiners, and the public.

Pro-Tip: Keep a one-line sticky note where you write — on the laptop, in a Notes app, above the desk: it's = it is · they're = they are · you're = you are · than → look for more/less/better. An editor I know cut her their/there slips by most of their number in a term, just by parking that reminder in front of her. After a week or two you'll internalise it and can bin the note. That's not cheating — that's how experts became experts.

Quick recap: - Reading aloud tests rhythm; substitution tests sound-alikes — don't confuse the two jobs. - Widen your than net to rather than, other than, no sooner… than. - Whose/who's uses the its/it's move; its deep rule lives in Pillar 2. - Name the real cause honestly — register, dialect, or house style is not the same as an error.

UK vs US

For these particular traps there is no genuine UK/US split, and you should be suspicious of anyone who claims one. The wrong forms fail the same way on both sides of the Atlantic, and the substitute tests work identically. The spelling of its/it's, their/there/they're, your/you're, and then/than does not flip between varieties. Surrounding words might — colour [US: color], organise [US: organize] — but that's a separate spelling convention, not a homophone. The one honest wrinkle: informal US writing leans on different than more readily, where many UK writers still reach for different from or different to. That's house style and register, not grammar — and then would be wrong in both.

Key Takeaways

• Sound-alikes defeat the ear; a substitute phrase defeats the trap.
• Its/it's: say it is (or it has) where the apostrophe sits — if it fits, keep the apostrophe.
• Their/there/they're: swap they are for they're; there hides here (a place); their is ownership.
• Your/you're: swap in you are — same logic as it's.
• Then/than: then is time; than is comparison — a more/less/better word nearby means than.
• Do a deliberate sound-alike sweep before you hand anything in; normal proofreading skips these entirely.

Check Your Understanding

Have a go before you peek — the answers are just below.

1. In "The robot closed it's hatch," which spelling is correct, and what swap proves it?
2. Fill the blanks: " going to leave ___ bags over ." (They're / Their / There)
3. True or false: reading a sentence aloud is enough to choose between your and you're.
4. Fix this line: "Your better at maths [US: math] then me."
5. Repair both errors: "We shipped earlier then planned, and their thrilled with the results."

Internal Links

• Pillar 2 — Its/It's and Whose/Who's: the full rule for these two possessive-vs-contraction pairs lives here.
• Pillar 8 — Their/There/They're, Your/You're, Then/Than: the deeper "why" for the rest of the confusables in this article.
• Meaning-Pair Confusables: for look-alike pairs that trip you on sense as much as sound.
• Word-Level sub-hub: the wider map of spelling and word-choice traps.
• Related Pillar 10 clinics: Apostrophe panic (possessives vs plurals), Agreement red-pen marks, Run-ons and comma splices.