Personal Pronouns in the Cases | Turkish Grammar

The subject pronouns — ben, sen, o, biz, siz, onlar — change shape when they become objects or take a case ending, exactly as nouns do. Most of these forms are perfectly regular. But three of them hide the only genuinely irregular noun paradigms in the entire language, so they are worth learning as a block, from a table, up front.

Case	ben (I)	sen (you)	o (he/she/it)	biz (we)	siz (you pl.)	onlar (they)
Nominative	ben	sen	o	biz	siz	onlar
Accusative (-(y)I)	beni	seni	onu	bizi	sizi	onları
Dative (-(y)A)	bana	sana	ona	bize	size	onlara
Locative (-DA)	bende	sende	onda	bizde	sizde	onlarda
Ablative (-DAn)	benden	senden	ondan	bizden	sizden	onlardan
Genitive (-(n)In)	benim	senin	onun	bizim	sizin	onların

The bold cells are the ones to watch. Everything else is the ordinary case machinery you already know from the case overview: biz → bizi, bize, bizde, bizden, bizim, and likewise siz and onlar, all behave like any regular noun. Learn the three columns ben, sen, o cold, and the pronoun system holds no more surprises.

Irregularity 1: the dative is bana and sana

If the pronouns were regular, the dative of ben would harmonise to *bene and sen to *sene. They don't. The stem vowel e unexpectedly lowers to a, giving bana and sana. This is genuinely irregular — it is not predicted by any sound rule and must simply be memorised.

Bana bir saniye izin verir misin?

Could you give me a second? (dative of ben → bana, NOT *bene)

Sana güveniyorum, lütfen beni yüzüstü bırakma.

I trust you, please don't let me down. (dative of sen → sana, NOT *sene)

The other ben/sen forms are regular — only the dative misbehaves. So you get the regular beni (accusative), bende (locative), benden (ablative), and then the rogue bana (dative). Watch the contrast inside one sentence:

Beni dinle, sonra bana cevap ver.

Listen to me, then answer me. (beni = regular accusative, bana = irregular dative)

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Drill the pair bana / sana until it's automatic. They're the single most common irregularity in Turkish — you'll say "to me" and "to you" dozens of times a day, and *bene / *sene is the most recognisable beginner slip there is.

Irregularity 2: o grows an n in every oblique case

The pronoun o is even stranger. In every case except the nominative, an n appears between the stem and the ending, and the vowel changes: not *oyu, *oa, *oda but onu, ona, onda, ondan, onun. The base for all oblique forms is effectively on-.

Onu dün akşam markette gördüm.

I saw him/her at the market last night. (accusative of o → onu)

Bu hediyeyi ona aldım.

I bought this gift for him/her. (dative of o → ona)

Onun fikrini henüz sormadım.

I haven't asked for his/her opinion yet. (genitive of o → onun)

This n is not random: it is the pronominal buffer consonant surfacing — the same buffer n that appears whenever a case ending lands on a possessive or a demonstrative. With o it shows up across the whole oblique paradigm, which is why the forms look so unlike their nominative. Once you see the n as a buffer rather than an oddity, the set onu, ona, onda, ondan, onun becomes a clean, learnable block.

Ondan hiç haber alamadım.

I never heard anything from him/her. (ablative of o → ondan)

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Don't analyse o as "o + ending." Treat on- as the working stem for every case but the nominative: on-u, on-a, on-da, on-dan, on-un. The n is a buffer doing exactly the job it does elsewhere in the grammar.

The genitives: benim, senin, onun

The genitive forms deserve a special note because they pair with possessed nouns and are extremely frequent. They are benim "my / of me," senin "your," onun "his/her/its," bizim "our," sizin "your (pl.)," onların "their." The first two break the usual pattern slightly — benim and senin rather than regularised forms — and onun carries the same buffer n seen above. These get their own detailed treatment on the possessive genitive page; here just fix the forms.

Benim adım Deniz, senin adın ne?

My name is Deniz, what's your name? (benim, senin — possessor pronouns)

Onun evi tam deniz kenarında.

His/her house is right by the sea. (onun — genitive of o, with buffer n)

The regular columns, for completeness

So you trust them, here are biz, siz, onlar behaving exactly like ordinary nouns — no lowered vowel, no rogue buffer beyond the normal rules:

Bize uğrar mısın, çay içeriz?

Will you drop by ours, we'll have tea? (dative of biz → bize, perfectly regular)

Sizden bir ricam olacak.

I'm going to have a request of you. (ablative of siz → sizden, regular)

Notice bize and size keep their e — the lowering to a is a quirk of ben/sen alone, not of all the pronouns. That contrast (bana but bize) is the clearest proof that the dative irregularity is lexical, attached to two specific words, not a general pronoun rule.

Common mistakes

❌ Bene bir bardak su verir misin?

Incorrect — the dative of ben is irregular: bana, not *bene.

✅ Bana bir bardak su verir misin?

Could you give me a glass of water?

❌ Sene güveniyorum.

Incorrect — the dative of sen is sana, not *sene.

✅ Sana güveniyorum.

I trust you.

❌ Bu çiçeği oa aldım.

Incorrect — oblique forms of o insert a buffer n: ona, not *oa.

✅ Bu çiçeği ona aldım.

I bought this flower for him/her.

❌ Ou görmedim bugün.

Incorrect — the accusative of o is onu, with the buffer n.

✅ Onu görmedim bugün.

I haven't seen him/her today.

❌ Oun fikrini sormadım.

Incorrect — the genitive of o is onun, with the buffer n, not *oun.

✅ Onun fikrini sormadım.

I haven't asked for his/her opinion.

Two errors dominate, and both are over-regularisation. The first is producing *bene / *sene by applying normal harmony — the fix is to drill bana / sana as fixed forms. The second is dropping the n from the o paradigm (*oa, *ou, *oun) — the fix is to treat on- as the stem. Get these two facts right and your pronouns are flawless, because every other form in the table is regular.

Key takeaways

biz, siz, onlar inflect regularly: bizi, bize, bizde, bizden, bizim, and so on — no surprises.
ben and sen have an irregular dative: bana, sana (never *bene, *sene); their other cases are regular.
o inserts a pronominal buffer n in every non-nominative case: onu, ona, onda, ondan, onun — the stem is effectively on-.
These three columns are the only truly irregular noun paradigms in Turkish; learn them as a block from the table.
The genitives benim, senin, onun are the high-frequency possessor forms — memorise them alongside the rest.

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