The converb -ken means "while / as" and marks simultaneity — one action forming the backdrop against which another happens. Yürürken düştüm — "I fell while walking". What sets -ken apart from every other converb is its shape: it never harmonizes. It is always -ken, attached to a tense stem or directly to a noun or adjective, and it pulls the stress onto the syllable in front of it.
What -ken does
-ken expresses that two situations overlap in time: while X was going on, Y happened. The -ken clause is the background; the main clause is the foreground event. The subjects can be the same or different.
Yürürken düştüm.
I fell while walking.
Sen uyurken ben çalıştım.
While you were sleeping, I worked.
Çıkarken ışıkları söndür.
Turn off the lights as you leave.
In sen uyurken ben çalıştım, the two clauses have different subjects (you / I), which -ken allows freely — like -(y)IncA and unlike the same-subject converbs. The "while" sense is about overlap, not sequence: the sleeping and the working were going on at the same time.
The English-speaker mistake to avoid is treating "while" as a word that introduces a clause. In Turkish there is no conjunction "while" in front; the simultaneity is the suffix -ken glued onto the verb.
-ken is invariant — it never harmonizes
This is the defining feature of -ken, and it makes the suffix unusually easy to spell: it is always -ken. It does not become -kan, -kın, or -kun. Where other converbs morph their vowel to match the stem, -ken stays frozen.
| Stem | Other converb (harmonizes) | -ken (frozen) |
|---|---|---|
| gel-ir (aorist) | gel-ince → gelince | gelir-ken → gelirken |
| oku-r (aorist) | oku-yunca → okuyunca | okur-ken → okurken |
| bak-ar (aorist) | bak-ınca → bakınca | bakar-ken → bakarken |
The vowel of -ken never changes, no matter how back or rounded the stem is. Gelirken, okurken, bakarken — same -ken every time.
Eve gelirken ekmek al.
Buy bread while you're on your way home.
Kitap okurken uyuyakaldım.
I dozed off while reading a book.
It is also pre-stressing: the word stress lands on the syllable right before -ken, never on -ken itself — yürÜrken, okUrken, çocUkken. This is one of the small set of stress exceptions in an otherwise final-stress language; see stress exceptions.
-ken on verbs: attach it to a tense stem, not a bare root
A second peculiarity: -ken does not attach to a bare verb root. It attaches to a tensed stem — most often the aorist (-Ir / -Ar), and also the present-continuous (-Iyor) or future (-AcAk). You then add -ken with no further tense.
Yemek yaparken telefon çaldı.
While I was cooking, the phone rang. (continuous stem yapıyor → yaparken with aorist)
Tam çıkacakken yağmur başladı.
Just as I was about to leave, it started to rain. (future stem çıkacak + -ken)
Ders çalışırken müzik dinlerim.
I listen to music while studying.
The aorist stem is the default for an ongoing background activity: yaparken, çalışırken, yürürken. The future-plus--ken form -AcAkken gives the vivid "just as I was about to..." reading. What you must not do is stack another tense after -ken, because the converb already sits on a tense stem and is itself untensed.
-ken on nouns and adjectives: "while being X"
Because -ken can attach directly to a nominal predicate, it also means "while being X / when one was X / as X". Here it glues straight onto the noun or adjective — no verb required. This is where the everyday word çocukken ("when I was a child") comes from.
Çocukken yazları köyde geçirirdik.
As children, we used to spend summers in the village.
Küçükken çok utangaçtım.
When I was little, I was very shy.
Çorba sıcakken için.
Drink the soup while it's hot.
Yemek hazırken herkesi çağırdı.
When the meal was ready, she called everyone.
Çocukken, küçükken, sıcakken, hazırken — the -ken simply follows the noun or adjective and means "while/when (it was) X". This nominal use has no clean English counterpart: English needs "when X was a child" or "while it is hot", a whole clause, where Turkish needs one word.
-ken vs -(y)IncA: overlap versus moment
Both render with "when" in English, but they are not interchangeable:
- -ken = "while", ongoing overlap. The background situation is in progress when the main event lands.
- -(y)IncA = "when / as soon as", a point that triggers the next event.
Eve gelirken seni gördüm.
I saw you while coming home / on the way home. (overlap, mid-journey)
Eve gelince seni aradım.
When I got home, I called you. (the arrival is the trigger point)
If the clause action is ongoing and the main event happens during it, use -ken. If the clause action is a completed point that triggers the main event, use -(y)IncA. For the noun-based explicit "at the time when", see time clauses with zaman.
Common mistakes
Trying to harmonize -ken (it is frozen):
❌ Okurkan uyudum.
Wrong: -ken never changes its vowel → okurken.
✅ Okurken uyudum.
I fell asleep while reading.
Attaching -ken to a bare root with no tense stem:
❌ Yürken düştüm.
Wrong: -ken needs a tense stem; use the aorist → yürürken (yürü- + -r + -ken).
✅ Yürürken düştüm.
I fell while walking.
Adding a tense after -ken:
❌ Çalışırkendim müzik dinledim.
Wrong: nothing follows -ken; it is already untensed on a tense stem → çalışırken.
✅ Çalışırken müzik dinledim.
I listened to music while studying.
Inserting a separate word for "while" in front of the clause:
❌ İken sen uyudun, ben çalıştım.
Wrong: 'while' is the suffix -ken on the verb, not a free word out front → sen uyurken ben çalıştım.
✅ Sen uyurken ben çalıştım.
While you were sleeping, I worked.
Using -(y)IncA for an ongoing "while" that needs -ken:
❌ Yemek yapınca telefon çaldı.
Wrong for 'while I was cooking': that overlap needs -ken → yemek yaparken telefon çaldı.
✅ Yemek yaparken telefon çaldı.
While I was cooking, the phone rang.
Key takeaways
- -ken means "while / as" and marks simultaneity — the background against which the main event happens.
- It is invariant: always -ken, never harmonizing, and pre-stressing (stress falls just before it: yürÜrken, çocUkken).
- On verbs it attaches to a tense stem (usually the aorist -Ir/-Ar, also -Iyor or -AcAk), with no further tense added.
- On nouns and adjectives it means "while being X" — çocukken, küçükken, hazırken, sıcakken.
- It allows different subjects in the two clauses, and contrasts with -(y)IncA: -ken is ongoing overlap, -(y)IncA is a trigger point.
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Start learning Turkish→Related Topics
- The Converb -(y)IncA ('when / as soon as')B1 — How -(y)IncA forms the everyday 'when' clause with no tense at all, replacing a finite conjunction-based clause.
- Converbs: Linking Clauses by SuffixB1 — How Turkish chains and subordinates clauses with adverbial verb suffixes — -(y)Ip, -(y)ArAk, -(y)IncA, -ken, -mAdAn, -DIkçA — instead of conjunctions.
- Stress Exceptions and Pre-Stressing SuffixesB1 — Why Turkish stress sometimes lands off the final syllable — the place names, loanwords, pre-stressing suffixes, and unstressed enclitics that all follow one underlying logic.
- Time Clauses with -DIğI zaman/-DIğIndAB2 — How to build 'when'-clauses with the -DIK nominalization plus zaman or the locative, the subject-marking alternative to -(y)IncA.