English has one verb, to know, that covers everything from knowing a person to knowing a phone number to knowing how to swim. Turkish — like Spanish, French, German and Portuguese — splits this into two verbs that are not interchangeable: tanımak (to be personally acquainted with someone, to recognise) and bilmek (to know a fact, a piece of information, or a skill). If you have studied Spanish, this is exactly the conocer versus saber distinction, and the same instincts transfer almost perfectly. If you haven't, this page builds the instinct from scratch.
The core distinction
The dividing line is acquaintance versus information.
- tanımak = to know a person through direct acquaintance, to recognise a face, to be familiar with a place or work first-hand. Think conocer.
- bilmek = to know that something is the case, to know a fact, an answer, a language, or how to do something. Think saber.
So “I know him” has two different translations depending on what you mean: Onu tanıyorum (I'm acquainted with him, we've met) versus Onu biliyorum (I know of him, I know facts about him — for example a famous person you've never met).
Ahmet'i tanıyorum, geçen yıl aynı ofiste çalıştık.
I know Ahmet, we worked in the same office last year.
O yazarı şahsen tanımıyorum ama bütün kitaplarını biliyorum.
I don't know that writer personally, but I'm familiar with all his books.
tanımak — forms and cases
The stem is tanı- (vowel-final), so it behaves like other vowel stems: the buffer -y- appears before vowel-initial suffixes, and the aorist adds only -r.
| Form | tanımak |
|---|---|
| present continuous (o) | tanıyor |
| aorist (o) | tanır |
| past (o) | tanıdı |
| negative continuous (o) | tanımıyor |
| question (o) | tanıyor mu? |
tanımak takes the accusative case for its object, because that object is always a specific, identifiable person, place or thing: Onu tanıyorum, Bu mahalleyi iyi tanırım. Beyond be acquainted with, it also means to recognise (a face after years), and figuratively to know someone's true nature.
Seni bu hâlinle hiç tanıyamadım, çok değişmişsin.
I barely recognised you looking like this — you've changed so much.
Bu sokakları avucumun içi gibi tanırım, burada büyüdüm.
I know these streets like the back of my hand, I grew up here.
Onu yıllardır tanırım; böyle bir şey asla yapmaz.
I've known him for years; he'd never do something like that.
The related verb tanışmak means to meet (for the first time), to get acquainted — it is the event that produces the state described by tanımak. “Tanıştığımıza memnun oldum” is the standard Nice to meet you.
bilmek — forms and cases
The stem is bil- (consonant-final). Its conjugation is regular, with one famous wrinkle: the aorist is bilir, but bilmek is also the half of the ability construction -Abilmek (“can / be able to”), which is why you see bil buried inside verbs like gidebilirim (I can go).
| Form | bilmek |
|---|---|
| present continuous (o) | biliyor |
| aorist (o) | bilir |
| past (o) | bildi |
| negative continuous (o) | bilmiyor |
| question (o) | biliyor mu? |
bilmek takes the accusative when its object is a definite noun (Cevabı biliyorum — I know the answer; Türkçeyi iyi biliyor — she knows Turkish well). But its most common pattern is to take a whole clause as its object, often nominalised with -DİK or -AcAK: “I know that you're tired” becomes Yorgun olduğunu biliyorum.
Onun nerede oturduğunu biliyorum ama adresini ezbere bilmiyorum.
I know where he lives, but I don't know his address by heart.
Yüzme bilmiyorum, o yüzden denize girmekten korkuyorum.
I can't swim, so I'm afraid to go into the sea.
Notice yüzme bilmek (literally to know swimming) for the skill sense — Turkish uses bilmek + verbal noun where English uses know how to.
The borderline cases
Two zones cause genuine hesitation even for advanced learners.
Places and works of art. A city or a book can go either way. tanımak stresses first-hand familiarity (“I know İstanbul, I've lived there, I can find my way”), while bilmek stresses information (“I know İstanbul is the largest city”). Both are correct; they just say different things.
İstanbul'u çok iyi tanırım, ama her sokağını bildiğimi söyleyemem.
I know İstanbul very well, but I can't say I know every one of its streets.
Knowing of versus knowing personally. For a celebrity you've never met, Turkish strongly prefers bilmek (you know facts about them) and finds tanımak odd unless you actually crossed paths.
Tabii ki onu biliyorum, herkes onu bilir; ama tanımıyorum, hiç tanışmadık.
Of course I know of him, everyone does; but I don't know him, we've never met.
Common mistakes
❌ Onu biliyorum, çocukluk arkadaşımız.
Wrong verb — for a real acquaintance you need tanımak; bilmek would mean you only know facts about him.
✅ Onu tanıyorum, çocukluk arkadaşımız.
I know him, he's our childhood friend.
❌ Cevabı tanıyorum.
Wrong verb — an answer is information, not a person to be acquainted with; use bilmek.
✅ Cevabı biliyorum.
I know the answer.
❌ Yüzme tanımıyorum.
Wrong verb — a skill is bilmek, never tanımak.
✅ Yüzme bilmiyorum.
I can't swim.
❌ Bu şehri biliyorum ama hiç gelmedim, yolumu bulamam.
Contradictory — claiming first-hand familiarity with bilmek while saying you've never been; first-hand knowledge of a place is tanımak.
✅ Bu şehri tanımıyorum, hiç gelmedim, yolumu bulamam.
I don't know this city, I've never been, I can't find my way.
❌ Onu tanıyorum derslerinden, ünlü bir bilim insanı.
If you've never met the famous scientist, tanımak is wrong; you know of him — use bilmek.
✅ Onu biliyorum derslerinden, ünlü bir bilim insanı.
I know of him from his lectures, he's a famous scientist.
Key takeaways
- tanımak (accusative): to be personally acquainted with a person, to recognise, to know a place first-hand — “Onu tanıyorum”.
- bilmek (accusative or a nominalised clause): to know a fact, an answer, a language, or how to do something — “Cevabı biliyorum”, “Yüzme bilmiyorum”.
- The split mirrors Spanish conocer / saber almost exactly.
- For a person you've actually met, choose tanımak; for a famous person you only know about, choose bilmek.
- tanışmak is the act of meeting that creates the tanımak state.
Now practice Turkish
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Start learning Turkish→Related Topics
- bilmek (to know / can)A2 — bilmek 'to know' — its aorist bilir, the -DIK complement for 'know that', and its grammaticalized life as the abilitative auxiliary -(y)Abil(mek), 'to be able to'.
- The Accusative -(y)I and DefinitenessA1 — The accusative ending marks a direct object as specific — and because Turkish has no word for 'the', the accusative effectively IS the definite article.
- Wrong Case (Especially Dative/Locative/Ablative)B1 — Why English prepositions lead you to the wrong Turkish case, and how to memorize verb-plus-case as a single unit.
- görmek (to see)A2 — A complete reference for görmek 'to see' — its accusative object, full tense forms, the gören vs gördüğüm participle contrast, and the rich family of göz idioms.