de/da and ki: Separate or Attached? | Turkish Grammar

This is the spelling mistake that Turkish people themselves correct each other over — it appears on protest signs, in grammar memes, and in every "things educated adults still get wrong" list. The problem is that Turkish has two different de/da and two different ki, and each pair contains one item that stands alone and one that attaches. Confuse them and you have not made a typo; you have arguably changed the meaning. The good news is that there is a foolproof test, and once you know it you never have to guess again.

The two de/da

Additive de / da means "too, also, even, as well." It is a free word — its own little particle — and it is always written separately, with a space before it. It comes in only two forms, de and da, chosen by the vowel of the previous word, and it never hardens to te or ta.

Locative -DA is a case suffix meaning "in, at, on." It is always attached to its noun, it obeys vowel harmony (-da / -de), and it hardens to -ta / -te after a voiceless consonant.

The two even look related, which is exactly why they get swapped. Compare:

	Additive de/da ("too")	Locative -DA ("in/at")
Spacing	separate word (space before)	attached suffix
Forms	only de / da	-da / -de / -ta / -te
Hardening	never (no te / ta)	yes, after f s t k ç ş h p
Meaning	"too, also, even"	"in, at, on"

Error 1: Attaching the additive de/da

The commonest error by far is writing the "too" particle stuck onto the previous word. Ben de geliyorum ("I'm coming too") becomes the wrong *Bende geliyorum — and bende is a real word meaning "on me / in my possession," so you have written something genuinely different.

❌ Bende geliyorum, beni bekleyin.

Incorrect — 'I too' is the separate particle 'ben de'; written attached, 'bende' means 'on me / in my possession'.

✅ Ben de geliyorum, beni bekleyin.

I'm coming too — wait for me.

❌ Sende mi bu kitaptan var?

Ambiguous/incorrect for 'you too' — attached 'sende' means 'on you/at your place'; the additive 'too' must be separate: 'sen de'.

✅ Sen de mi bu kitabı okudun?

Did you read this book too?

Note that the additive particle never hardens, even after a voiceless consonant. "The bag too" is çanta da, and "the book too" is kitap da — never *kitap ta, because hardening belongs to the suffix, not to the free word.

❌ Kitap ta çantamda, kalem ta.

Incorrect — the additive 'too' never hardens to 'ta'; it stays 'da' as a separate word: 'kitap da', 'kalem de'.

✅ Kitap da çantamda, kalem de.

The book's in my bag too, and the pen as well.

Error 2: Detaching the locative -DA

The mirror-image mistake: writing the "in/at" suffix as a separate word. "At home" is evde — one word — not *ev de. Detach it and a reader sees the additive particle, so ev de reads as "the house too."

❌ Akşam ev de buluşalım.

Incorrect — 'at home' is the attached locative 'evde'; written apart, 'ev de' means 'the house too'.

✅ Akşam evde buluşalım.

Let's meet at home this evening.

And here the hardening does apply, because it is a suffix: after the voiceless k of sokak ("street"), the locative is -ta.

❌ Çocuklar sokakda oynuyor.

Incorrect — after the voiceless k, the locative suffix hardens: sokakta, not sokakda.

✅ Çocuklar sokakta oynuyor.

The kids are playing in the street.

❌ Toplantı saat üçte ofis te başlıyor.

Incorrect — 'in the office' is the attached locative 'ofiste' (one word, hardened -te), not a separate 'ofis te'.

✅ Toplantı saat üçte ofiste başlıyor.

The meeting starts at three in the office.

The removal test — your one reliable tool

You never have to memorise which is which. Try deleting the de/da. If the sentence still stands as a complete, grammatical sentence, the de/da was the separable additive word — write it apart. If removing it leaves a broken, incomplete sentence, it was the locative case suffix — attach it.

Take Ben de geldim ("I came too"). Remove de: Ben geldim ("I came") — still a perfect sentence. So de is separable: ben de.

Now take Evde kaldım ("I stayed at home"). Remove de: Ev kaldım — meaningless ("house I-stayed"). So the -de is structural: it must attach: evde.

❌ Ben de kaldım demek istemiştim ama bende kaldım yazdım.

Illustrative error — 'I stayed too' needs the separable 'ben de'; the attached 'bende' would mean 'it stayed on me/with me'.

✅ Ben de kaldım.

I stayed too. (Remove 'de' → 'Ben kaldım' still works, so it's separate.)

💡

The removal test in one line: delete the de/da and reread. Sentence survives → separate word. Sentence collapses → attached suffix. This single check resolves every de/da decision in Turkish.

The same split for ki

ki has exactly the same separate-versus-attached problem. The free conjunction ki ("that, so that") joins clauses and is always written separately: Duydum ki gelmişsin ("I heard that you'd come"). The suffix -ki forms a relative/locative modifier ("the one in/at/of…") and is attached: evdeki kitap ("the book that's in the house"). The attached -ki is special in that it usually does not change for vowel harmony — it stays ki after most vowels (masadaki, yarınki), with a small set of harmonised exceptions like bugünkü and dünkü.

❌ Masada ki kitap senin mi?

Incorrect — the relative -ki ('the one on the table') attaches: masadaki, one word.

✅ Masadaki kitap senin mi?

Is the book on the table yours?

❌ Öyle yoruldum ki, oturduğum yerde uyumuşum.

Correct as written — contrast: the conjunction 'ki' ('so... that') is a separate word here.

✅ Bak ki yağmur başlamış, şemsiyeni al.

Look — it's started raining; take your umbrella. (free conjunction 'ki', separate).

💡

For ki, ask whether you can replace it with English "the one that's…" (then it's the attached suffix -ki: evdeki, yarınki) or with "that / so that" linking two ideas (then it's the free word ki, written apart).

Common mistakes

❌ O da gelsin, bende çok eğleniyorum.

Incorrect — 'I'm having fun too' needs the separable 'ben de'; 'bende' means 'on me'.

✅ O da gelsin, ben de çok eğleniyorum.

Let him come too; I'm having a great time as well.

❌ Anahtarlar masada, telefon da masa da.

Incorrect — 'on the table' is the attached locative 'masada'; the additive 'too' is the separate 'da'. The second 'masa da' should be 'masada'.

✅ Anahtarlar masada, telefon da masada.

The keys are on the table, and the phone's on the table too.

❌ Hava o kadar soğuktu ki camlar buz tuttu derken sınıfta ki çocuklar üşüdü.

Incorrect — 'the kids in the class' is the attached relative 'sınıftaki', one word.

✅ Hava o kadar soğuktu ki sınıftaki çocuklar üşüdü.

It was so cold that the kids in the classroom got chilly.

❌ İşten çıkınca markete uğra, ekmek te al.

Incorrect — the additive 'too' never hardens to 'te' and is always separate: 'ekmek de'.

✅ İşten çıkınca markete uğra, ekmek de al.

Stop by the shop after work and get bread too.

Key takeaways

Additive de/da ("too") is always a separate word and never hardens. Only de / da exist; never te / ta. Attaching it (*bende for "me too") often produces a different real word.
Locative -DA ("in/at") is always attached and does harden to -ta / -te after a voiceless consonant. Detaching it (*ev de) turns "at home" into "the house too."
The removal test settles everything: delete the de/da — if the sentence survives, write it separately; if it collapses, attach it.
ki splits the same way: the conjunction ki ("that/so that") is separate; the relative suffix -ki ("the one in/at…") attaches and mostly ignores vowel harmony.

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