ki-Clauses: Finite Subordination

Turkish normally packs subordinate clauses inside the main clause, before the verb, using nominalizing suffixes: Haklı olduğunu sanıyorum "I think that you're right," literally "your-being-right I-think." But Turkish also has a second, un-Turkish strategy borrowed from Persian: the standalone word ki, which lets a full finite clause hang off the main verb in European word order — Sanıyorum ki haklısın, "I think that you're right," verb first, clause after. This page maps where finite ki is grammatical, where it is merely tolerated, and where it is genuinely idiomatic. (The connective's syntax is treated more fully on the ki connective page; here we focus on its clausal jobs and register.)

What makes ki different

Every native Turkish subordinate clause is non-finite: its verb is turned into a noun or participle and slotted before the matrix verb. ki does the opposite — it introduces a finite clause (a clause with a normal, tensed, person-marked verb) and places it after the matrix verb, just like English that or German dass. That borrowed shape is exactly why it feels foreign and stays stylistically marked.

Both are perfectly grammatical. But in neutral, careful prose a Turkish writer will usually prefer the native nominalization: Bu işin sonunun iyi olmayacağını sanıyorum. The ki versions are more conversational, more emphatic, often slightly more dramatic — and in formal academic writing the nominalized version is the safer default.

Where finite ki is genuinely alive

Although the ki-complementizer is bookish, several of its uses are completely natural and unavoidable in everyday Turkish. These are the ones to actively learn.

1. Result clauses: o kadar / öyle … ki

This is the single most idiomatic ki construction in the spoken language: an intensifier (o kadar "so much," öyle "so," o derece "to such a degree") sets up a degree, and ki introduces the consequence.

Here ki is not optional and not marked — it is the standard way to say "so … that." Because it deserves its own treatment, the full pattern (including the native alternatives) lives on the result clauses page.

2. Set discourse phrases

A handful of frozen connectors use ki and are extremely common. Learn them as units:

• demek ki "so / that means / it follows that"
• öyle ki "so much so that / such that"
• o kadar ki "to the point that"
• bereket ki / iyi ki "luckily / it's a good thing that"
• ne var ki "however / but the thing is"

3. Emphatic exclamatives

ki can cap a sentence for emotional emphasis, often trailing off, leaving the consequence to the listener's imagination.

4. The rhetorical "imagine that…": Düşün ki

ki introduces a hypothetical scenario you invite the listener to picture, with verbs like düşün "imagine," farz et "suppose," diyelim "let's say."

The bookish complementizer: keep it, but know its place

After verbs of saying, thinking, and perceiving, ki can introduce the reported content as a full finite clause. This is grammatical, has a long literary pedigree, and is common in speech for emphasis — but it is the marked option against native nominalization.

Compare the two strategies for the same idea:

Both columns mean the same thing. The right column foregrounds the matrix verb and delivers the content as a punchline; it is favoured in oratory, older literary prose, and lively speech. The left column is what neutral and academic Turkish prefers. Use the nominalized complements as your workhorse and deploy ki for effect.

ki (word) vs -ki (suffix): never confuse them

Two homophones with nothing in common beyond their spelling:

• ki — a separate word, the borrowed conjunction of this page: Diyorum ki…, o kadar … ki…
• -ki — an attached suffix (the locative-genitive relativizer) that does not harmonize in the standard cases: benimki "mine," masadaki kitap "the book on the table," dünkü maç "yesterday's match" (here it does harmonize to -kü).

The full contrast is handled on the separate ki suffix page; just remember: if it's a free word meaning roughly "that / so that," it's ki; if it attaches to a noun and means "the one belonging to / at," it's -ki.

Common mistakes

For a plain "I know that…", the native nominalization (geleceğini) is the neutral choice; don't reflexively reach for ki, and never stack it.

In a result clause the ki is obligatory; this is the one place you must not drop it.

The conjunction ki is always a separate word; only the relativizer -ki is attached.

Here you need the suffix -ki (attached: benimki), not the free conjunction.

Key takeaways

• ki is a borrowed, finite subordinator that places a full clause after the verb — un-Turkish word order; native nominalization (-DIK / -mA / -(y)AcAK) is the neutral default.
• Its living, idiomatic uses are: result clauses (o kadar / öyle … ki), set phrases (demek ki, iyi ki, ne var ki), exclamatives, and Düşün ki… scenarios.
• As a plain complementizer (Sanıyorum ki…) it is grammatical but marked — emphatic, conversational, or literary.
• In result clauses the ki is obligatory; as an everyday "that" it is dispreferred.
• The free word ki ≠ the attached suffix -ki (benimki, masadaki) — different grammar entirely.