Conjunctive and Complement Clauses in Persian

In Brief

Persian commonly uses که (ke, “that”) to introduce a complement clause—a clause that completes the meaning of “think,” “say,” “know,” “be sure,” and similar expressions: فکر می‌کنم که درست است means “I think that it is correct.” With indirect questions, a question word such as چرا (“why”) or کجا (“where”) normally introduces the embedded question instead. Unlike English, Persian does not change to question word order inside that clause.

Overview

A clause is a group of words built around a verb. A complement clause is a clause used as the content of a thought, statement, piece of knowledge, wish, or feeling. In “I know that Mina is here,” the bold part tells us what the speaker knows. Persian often joins the two clauses with که.

This pattern becomes especially useful around B1 because it lets you move beyond separate short statements. You can report what someone said, qualify an opinion, express confidence or doubt, and ask about information indirectly. The same form که also introduces relative clauses, but its job is different here. In کتابی که خواندم (“the book that I read”), the clause identifies a noun; in می‌دانم که کتاب را خواندی (“I know that you read the book”), the whole clause supplies what is known.

English “that” is a helpful starting comparison, but it is not a perfect guide. Persian که is often retained where conversational English would omit “that,” while Persian indirect questions usually begin directly with their question word. Persian also keeps its normal verb-final tendency inside the embedded clause.

How It Works

The basic pattern with که

The usual structure is:

main expression + که + complete clause

In the second clause, build an ordinary Persian statement: subject or topic first when stated, objects and other elements before the verb, and the verb normally at the end.

Main expression	Connector	Complement clause	Whole meaning
فکر می‌کنم	که	علی خانه است	I think that Ali is home.
می‌دانیم	که	او فارسی می‌خواند	We know that he/she studies Persian.
گفت	که	فردا می‌آید	He/she said that he/she would come tomorrow.
مطمئنم	که	موفق می‌شوی	I am sure that you will succeed.

Persian often leaves a subject pronoun unstated when the verb or context makes the person clear. Thus می‌دانم که نمی‌آید can mean “I know that he/she won’t come.” The ending of می‌آید marks third-person singular, but Persian does not mark gender in this pronoun or verb.

Expressions that commonly take a complement

The word before که need not be a single verb. It can be a verb phrase, an adjective with “be,” or a noun-based expression.

Function	Common Persian expression	Meaning
Thought or opinion	فکر کردن، به نظر رسیدن	to think; to seem
Speech or reporting	گفتن، توضیح دادن، شنیدن	to say; to explain; to hear
Knowledge or discovery	دانستن، فهمیدن، متوجه شدن	to know; to understand/find out; to realize
Certainty or possibility	مطمئن بودن، معلوم بودن، ممکن بودن	to be sure; to be clear; to be possible
Desire or request	خواستن، ترجیح دادن، درخواست کردن	to want; to prefer; to request

The tense and person of each clause are chosen separately. In می‌دانم که رفت (“I know that he/she left”), می‌دانم is present but رفت is past. In فکر می‌کردم که می‌آید (“I thought that he/she was coming/would come”), both forms fit the viewpoint in the past.

Stating a fact, opinion, or report

After verbs such as دانستن (“to know”), گفتن (“to say”), and فکر کردن (“to think”), the embedded clause generally has the form appropriate to the intended meaning:

• می‌دانم که سارا اینجا کار می‌کند. — I know that Sara works here.
• گفت که وقت ندارد. — He/she said that he/she does not have time.
• فکر می‌کنم که جلسه تمام شده است. — I think that the meeting has ended.

Persian does not mechanically shift every embedded verb one tense backward merely because the reporting verb is past. Choose the tense for whether the embedded situation is still true, was true then, or happened earlier. گفت که خسته است can present the tiredness as current or still relevant; گفت که خسته بود places it in the past.

Wanting and other non-factual complements

After خواستن (“to want”), a complement with a different subject commonly uses the Persian subjunctive—a verb form used for desired, possible, or non-asserted actions. The present subjunctive typically has بـ plus the present stem and personal ending:

• می‌خواهم که بیایی. — I want you to come.
• می‌خواهیم که زودتر شروع کنند. — We want them to start earlier.

The subject is understood from the embedded verb ending: بیایی is “you come,” while بیایند is “they come.” With the same subject, Persian often prefers a more compact construction, especially in ordinary speech: می‌خواهم بروم (“I want to go”). Saying می‌خواهم که بروم is possible, but the explicit clause boundary gives the sentence more weight.

Other expressions of necessity, possibility, emotion, or evaluation may also favor the subjunctive when the event is not presented as a settled fact: ممکن است که دیر برسد (“It is possible that he/she may arrive late”). The choice depends on the governing expression and intended meaning, not on که alone.

Indirect questions

An indirect question embeds a question as the content of “know,” “ask,” “remember,” “understand,” and similar expressions. With a question word, put that word at the start of the embedded clause:

main expression + question word + statement-like clause

Direct question	Indirect question	Meaning
چرا رفت؟	نمی‌دانم چرا رفت.	I don’t know why he/she left.
کجا زندگی می‌کند؟	می‌دانی کجا زندگی می‌کند؟	Do you know where he/she lives?
جلسه کی شروع می‌شود؟	پرسید جلسه کی شروع می‌شود.	He/she asked when the meeting starts.
چه کسی آمد؟	فهمیدیم چه کسی آمد.	We found out who came.

Do not add English-style auxiliary inversion. Persian has no equivalent of changing “he is” to “is he” here. The embedded clause follows Persian syntax, with the verb normally late in the clause.

For an indirect yes/no question, formal or careful Persian often uses آیا ... یا نه (“whether ... or not”):

• نمی‌دانم آیا می‌آید یا نه. — I don’t know whether he/she is coming or not.
• پرسیدم آیا فروشگاه باز است. — I asked whether the shop was open.

In conversation, آیا is frequently omitted: نمی‌دانم می‌آید یا نه. A که may occur before an indirect-question clause in some contexts, especially as a discourse link, but learners should not automatically translate English “that” before چرا، کجا، کی، آیا. The clean default is to let the question word introduce the embedded question.

Examples in Context

Persian	English	Note
فکر می‌کنم که درست است.	I think that it is correct.	Opinion followed by که
می‌دانم که نمی‌آید.	I know that he/she won’t come.	Negative complement clause
مطمئنم که موفق می‌شوی.	I’m sure that you’ll succeed.	Adjective-based expression
نازنین گفت که فردا تماس می‌گیرد.	Nazanin said that she would call tomorrow.	Reported statement
شنیدم که یک رستوران جدید باز شده است.	I heard that a new restaurant has opened.	Information received from another source
متوجه شدیم که آدرس اشتباه بود.	We realized that the address was wrong.	Past main and embedded clauses
ممکن است که قطار دیر برسد.	The train may arrive late.	Possibility with a subjunctive verb
می‌خواهم که این متن را بخوانی.	I want you to read this text.	Different subject; بخوانی is subjunctive
می‌خواهم زود بخوابم.	I want to go to sleep early.	Same subject; که is normally unnecessary
نمی‌دانم چرا رفت.	I don’t know why he/she left.	Indirect why-question
می‌دانی کلیدها کجا هستند؟	Do you know where the keys are?	The location phrase is embedded
از او پرسیدم چه زمانی برمی‌گردد.	I asked him/her when he/she would return.	Formal question phrase چه زمانی
هنوز معلوم نیست چه کسی برنده شده است.	It is not yet clear who has won.	Question phrase acts as the complement
نمی‌دانیم آیا فردا تعطیل است یا نه.	We don’t know whether tomorrow is a holiday or not.	Formal yes/no alternative

Common Mistakes

Using که as both a connector and a question word by default

• Awkward default: نمی‌دانم که چرا رفت.
• Natural core pattern: نمی‌دانم چرا رفت.
• Why: In a straightforward indirect question, چرا already introduces the missing information. A sentence with که چرا can occur when که has a broader linking or emphatic role, but it should not be your automatic translation of English “that + why.”

Copying English question order

• Wrong: می‌دانی کجا هستند کلیدها؟
• Right: می‌دانی کلیدها کجا هستند؟
• Why: The embedded question uses normal Persian clause order. Put کلیدها before the location predicate کجا هستند.

Treating که as a signal for one fixed tense

• Wrong idea: A verb after که must always be present or always be past.
• Right: می‌دانم که رفت / می‌دانستم که رفته بود
• Why: The first means “I know that he/she left”; the second means “I knew that he/she had left.” Time relationships determine the tense.

Using an indicative form after wanting someone to act

• Wrong: می‌خواهم که می‌آیی.
• Right: می‌خواهم که بیایی.
• Why: The arrival is wanted, not asserted as a fact, so Persian normally uses the subjunctive بیایی.

Overusing an explicit pronoun

• Less natural without contrast: فکر می‌کنم که او درست می‌گوید when everyone already knows who “he/she” is.
• Often more natural: فکر می‌کنم که درست می‌گوید.
• Why: Persian commonly omits recoverable subject pronouns. Keep او when it prevents ambiguity or marks contrast.

Usage Notes

In careful writing, که clearly marks the boundary between a reporting expression and its content. In speech it may be pronounced lightly, and speakers sometimes omit it when the relationship is obvious: فکر کنم دیر شده (“I think it’s late”). For learners, retaining که in full sentences is a safe and clear default; learn the reduced patterns as listening vocabulary before using them freely.

Colloquial pronunciation also changes common forms: می‌خواهم becomes می‌خوام, می‌دانم becomes می‌دونم, and است may be reduced or attached to the preceding word. These are register differences, not different clause rules. Formal writing normally uses می‌خواهم، می‌دانم، است.

English often drops “that” after “think” or “say.” Persian may keep که naturally, so do not judge its presence by the English translation. Conversely, English uses “whether” for indirect yes/no questions, while Persian can use formal آیا, the pair یا نه, or simply context and intonation.

Beyond the Basics / Advanced Use

که as a broader discourse connector

In real conversation, که does more than translate “that.” It can connect an explanation, reminder, objection, or consequence to what came before. Its exact force may be closer to “you know,” “since,” or “after all,” depending on context. This wider discourse use explains why word-for-word translation is unreliable. At B1, focus first on clearly governed complements after thinking, saying, and knowing; interpret broader uses from context.

Reporting without automatic backshift

English learners are often taught to change “is” to “was” after “said.” Persian has no single mandatory backshift rule of that kind. Compare:

• گفت که مریض است. — He/she said that he/she is ill. The illness is treated as current or relevant now.
• گفت که مریض بود. — He/she said that he/she was ill. The illness is located in the past.
• گفت که مریض شده بود. — He/she said that he/she had become ill. The change happened before another past viewpoint.

The speaker’s intended timeline controls the form. This makes Persian reported content flexible, but it also means that tense choice carries meaning.

Ambiguous subjects and clarity

Because Persian can omit pronouns and does not mark “he” versus “she,” a chain of clauses can become ambiguous. علی به رضا گفت که دیر می‌آید may leave context to decide who is coming late. Add a noun, او, or restructure the sentence when identity matters. Natural pronoun omission should never come at the cost of comprehension.

Complement که versus relative که

Both constructions use the same written form, but ask what the following clause does:

Construction	Example	Test
Complement clause	می‌دانم که مریم آمد.	The clause answers “What do I know?”
Relative clause	مریمی که آمد خواهرم بود.	The clause identifies which Mary/person is meant.

A relative clause attaches to a noun. A complement clause fills out the meaning of a verb, adjective, or larger expression. This distinction is more useful than trying to assign a single English translation to که.

Practice Tips

1. Build clause pairs. Start with two complete statements—فکر می‌کنم and هوا خوب است—then join them: فکر می‌کنم که هوا خوب است. Repeat with می‌دانم، شنیدم، گفت and مطمئنم.
2. Transform direct questions. Write a direct question such as قطار کی می‌رسد؟, then place it after نمی‌دانم: نمی‌دانم قطار کی می‌رسد. Check that you did not add English-style inversion.
3. Sort fact from desire. Make two columns: factual complements after می‌دانم and desired or possible actions after می‌خواهم or ممکن است. Highlight the subjunctive forms in the second column.

Related Concepts

• Prerequisite: Relative Clauses with که — compare a clause that modifies a noun with one that supplies the content of a thought or statement.