Finite Complement Clauses with که | Farsi Grammar

A finite complement clause supplies the content of a speech, thought, emotion, or evaluation: می‌دانم که راه بسته است “I know that the road is closed,” امیدوارم که زود برسی “I hope you arrive soon,” or عجیب است که هنوز تماس نگرفته “It is strange that she still has not called.” Persian commonly places the invariant complementizer که before that content.

The crucial word is finite. The complement has a verb whose person, tense, aspect, mood, and polarity are chosen for its own subject and meaning. English alternates among that clauses, to infinitives, and -ing clauses; Persian uses finite complements in many places where English prefers an infinitive. که marks the clause boundary, but it does not itself determine whether the following verb is indicative or subjunctive.

The construction map

Predicate class	Frequent frame	Usual mood logic	Example content
speech/report	گفت / توضیح داد که ...	indicative for assertions; subjunctive for commands or requests	گفت که می‌آید
knowledge/belief	می‌داند / فکر می‌کند که ...	indicative for an assessed proposition; subjunctive under doubt or negation	می‌دانم که رسیده است
emotion/desire	خوشحالم / امیدوارم که ...	indicative for a fact; subjunctive for a desired or feared prospect	خوشحالم که آمدی
evaluation/necessity	عجیب است / لازم است که ...	indicative for evaluated fact; subjunctive for projected action	لازم است که برویم

مدیر توضیح داد که سامانه تا عصر دوباره فعال می‌شود.

modir towzih dâd ke sâmâne tâ asr dobâre fa'âl mi-shavad.

The manager explained that the system would be active again by the afternoon. (formal-neutral; asserted report)

می‌دانم که این مسیر بعد از غروب خلوت می‌شود.

mi-dânam ke in masir ba'd az ghorub khalvat mi-shavad.

I know that this route gets quiet after sunset. (neutral standard; knowledge complement)

Although Persian is broadly verb-final, a heavy content clause commonly follows its matrix predicate: می‌دانم + که .... This order lets the short matrix expression announce the speaker's stance before the longer content. A nominalized این‌که clause can instead occupy a regular noun-phrase position—این‌که دیر رسید را می‌دانم—but that marked structure means “I know the fact that he arrived late,” not the ordinary neutral “I know that he arrived late.”

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Locate two predicates. The matrix predicate says what the speaker does with the information—knows it, says it, fears it, evaluates it. The finite complement supplies the information itself.

Indicative complements: facts, assertions, and beliefs

Indicative mood is natural when the matrix predicate presents the content as a fact, assertion, perception, or belief that the subject entertains. This remains true even when the larger sentence is past or negative: mood follows the status of the content, not simply the shape of که.

خوشحالم که پیشنهادت را قبول کردند.

khoshhâl-am ke pishnehâd-at râ qabul kardand.

I'm glad that they accepted your proposal. (neutral; emotion about an established fact)

باور دارم که این تیم می‌تواند مسئله را حل کند.

bâvar dâram ke in tim mi-tavânad mas'ale râ hall konad.

I believe that this team can solve the problem. (neutral/formal; belief presented as the speaker's position)

عجیب است که هیچ‌کس درباره‌ی آن ایمیل چیزی نگفته است.

ajib ast ke hich-kas darbâre-ye ân imeyl chizi na-gofte ast.

It is strange that nobody has said anything about that email. (neutral standard; evaluation of an apparent fact)

The final example is important: عجیب است does not force subjunctive mood. The speaker takes the silence as real and evaluates it. English learners sometimes associate emotion or evaluation with a “subjunctive trigger,” but Persian mood is sensitive to whether the complement is asserted, desired, feared, doubted, or merely projected.

Subjunctive complements: desired, required, or non-asserted events

Prospective desires, requests, requirements, fears, and doubts commonly select the present subjunctive. The event lies in a space of intention or possibility rather than being presented as an established fact.

امیدوارم که پیش از شروع جلسه برسی.

omidvâram ke pish az shoru'-e jalase be-resi.

I hope you arrive before the meeting starts. (neutral; desired future event)

لازم است که همه‌ی فرم‌ها را امروز امضا کنید.

lâzem ast ke hame-ye form-hâ râ emruz emzâ konid.

It is necessary that you sign all the forms today. (formal; projected requirement)

می‌ترسم که آخرین اتوبوس را از دست بدهیم.

mi-tarsam ke âkharin otobus râ az dast be-dahim.

I'm afraid we may miss the last bus. (neutral; feared possibility)

Negating or questioning a thought predicate can weaken commitment and favor subjunctive mood: فکر نمی‌کنم برسد “I don't think she will arrive.” By contrast, می‌دانم که نمی‌رسد “I know she will not arrive” keeps an indicative because the negative belongs inside content that the speaker treats as known.

فکر نمی‌کنم که تا ساعت شش کارشان تمام شود.

fekr nemi-konam ke tâ sâ'at-e shesh kâr-eshân tamâm shavad.

I don't think they will finish their work by six. (neutral standard; non-asserted prediction)

There is genuine lexical and contextual variation here. فکر می‌کنم بیاید can present a tentative prediction with the subjunctive, while فکر می‌کنم می‌آید treats the prediction more like the speaker's assessed conclusion. No list of words replaces attention to commitment and event status.

Same subject and different subjects

Because the complement verb is finite, it can have the same subject as the matrix verb or a different one. Persian does not require an English-style to infinitive when the subjects match.

امیدوارم فردا زودتر برگردم.

omidvâram fardâ zudtar bar-gardam.

I hope to return earlier tomorrow. (neutral; same understood first-person subject)

امیدوارم شما هم فردا زودتر برگردید.

omidvâram shomâ ham fardâ zudtar bar-gardid.

I hope you also return earlier tomorrow. (neutral/polite; different overt subject)

Persian pro-drop makes same-subject readings especially easy: first-person برگردم identifies the complement subject without من. With a different or contrastive subject, state it: شما ... برگردید. Some verbs of wanting and trying participate in tighter finite-control patterns, but the practical principle remains that the complement ending, not an infinitive, identifies the participant.

When که is optional—and when keeping it helps

After frequent matrix expressions, conversational Persian often omits که when the clause boundary is obvious: فکر می‌کنم دیر برسد, امیدوارم حالش بهتر شود, گفت فردا می‌آید. Omission is most natural in speech and does not remove the finite-clause structure.

فکر کنم این کافه پنجشنبه‌ها تعطیله.

fekr konam in kâfe panjshanbe-hâ ta'til-e.

I think this café is closed on Thursdays. (informal, regional: Tehran; که omitted)

Careful prose normally keeps که when it clarifies a long or nested boundary. It is particularly useful after a noun expressing content: این ادعا که ... “the claim that ...”. Here omission may be impossible or change the analysis. Also remember that که has relative, temporal, causal, and focus uses; this page covers only complement clauses. The broader distribution is introduced in Complementizer که.

Persian also lacks obligatory English backshift. گفت که بیمار است may mean the person was said to be ill and remains so; گفت که بیمار بود locates the illness in a past interval. Choose the complement tense for its intended time relation, as detailed in Reported Speech and Tense Retention.

Common Mistakes

1. Replacing the finite complement with an infinitive

❌ امیدوارم که فردا آمدن.

Incorrect — آمدن has neither person nor subjunctive marking.

✅ امیدوارم که قطعه‌ی لازم فردا برسد.

omidvâram ke qet'e-ye lâzem fardâ be-rasad.

I hope the necessary part arrives tomorrow.

2. Letting که choose mood by itself

❌ می‌دانم که او در خانه باشد.

Incorrect for ordinary factual knowledge — که does not automatically require the subjunctive باشد.

✅ می‌دانم که مسئول شیفت الان در ساختمان است.

mi-dânam ke mas'ul-e shift alân dar sâkhtemân ast.

I know that the shift supervisor is in the building now.

3. Losing subject agreement across clauses

❌ امیدواریم که من نتیجه را بگیریم.

Incorrect — complement subject من requires first-singular بگیرم, not plural بگیریم.

✅ امیدواریم که من تا فردا نتیجه را بگیرم.

omidvârim ke man tâ fardâ natije râ be-giram.

We hope that I get the result by tomorrow.

4. Backshifting merely because the matrix verb is past

⚠️ پریروز گفت که فردا جلسه داشت.

pariruz goft ke fardâ jalase dâsht.

Grammatical only with a genuinely past reading of داشت; do not choose it merely because English backshifts after said.

✅ پریروز گفت که روز بعد جلسه دارد.

pariruz goft ke ruz-e ba'd jalase dârad.

The day before yesterday, she said that she had a meeting the next day.

Key Takeaways

که introduces content, while the complement's own predicate controls tense, person, mood, and negation.
Indicative complements present facts, assertions, or assessed beliefs; subjunctive complements commonly present desires, requirements, fears, doubts, and projected events.
Same-subject and different-subject complements are both finite; Persian often uses them where English uses an infinitive.
که is often omitted after frequent predicates in conversation, but careful writing keeps it when the boundary is long or ambiguous.

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