Infinitive or اینکه Clause? | Farsi Grammar

Choose a Persian long infinitive when you want to package an activity as a compact, noun-like event: بعد از رسیدن تماس گرفتم “I called after arriving.” Choose an اینکه clause when the embedded situation needs its own explicit subject, finite tense or aspect, or propositional viewpoint: از اینکه سارا دیر رسید ناراحت شدم “I was upset that Sara arrived late.” A negative infinitive can still package nonoccurrence as an event noun.

This is not simply English to/-ing versus that. The Persian infinitive has no person or tense marking, though a nominal phrase around it can name participants. A finite clause makes a full proposition. The decision is therefore one of informational weight: are you naming an event as a compact unit, or asserting a separately organized situation?

The decision tree

Does a preposition such as برای، قبل از، بعد از، بدون، از introduce a short event whose performer is obvious? Prefer the infinitive.
Must you state a different human subject prominently? Prefer اینکه + finite clause.
Must the embedded event show past, ongoing aspect, perfect time, mood, or independently scoped polarity? Choose a finite clause. Simple nominal negation such as نیامدن “not coming” can remain infinitival.
Is the event being treated as a formal process or topic rather than narrated? A nominal infinitive can be concise and appropriately formal.
Is the infinitival phrase becoming long or hard to parse? Expand it into an اینکه clause.
Does the matrix verb itself select a finite subjunctive, as with می‌خواهم بروم? Use that construction; do not insert either a long infinitive or اینکه mechanically.

Communicative need	Preferred form	What remains explicit	Example frame
compact shared-subject event	long infinitive	event only	بعد از رسیدن
event nominal with lexical participant	long infinitive phrase	participant as nominal dependent	پیش از آمدن مهمان‌ها
distinct or contrastive subject	اینکه clause	finite subject and person	از اینکه او آمد
independent tense/aspect	اینکه clause	temporal viewpoint	بعد از اینکه رسیده بود
selected desire/ability complement	finite subjunctive without اینکه	controlled subject	می‌خواهم بروم

Choose the infinitive for a compact event

The long infinitive ends in ـن and behaves partly like a noun. It fits naturally after prepositions and can serve as the topic or subject of an evaluation. Its performer is often inherited from the main clause or obvious from context.

بعد از رسیدن به هتل به مادرم زنگ زدم.

ba'd az residan be hotel be mâdar-am zang zadam.

After arriving at the hotel, I called my mother. (neutral; shared subject)

برای دیدن نمایشگاه با مترو به مرکز شهر رفتیم.

barâ-ye didan-e namâyeshgâh bâ metro be markaz-e shahr raftim.

We went downtown by metro to see the exhibition. (neutral; shared subject)

رانندگی در جاده‌ی یخ‌زده بدون زنجیر چرخ خطرناک است.

rânandegi dar jâde-ye yakh-zade bedun-e zanjir-e charkh khatarnâk ast.

Driving on an icy road without snow chains is dangerous. (formal-neutral event topic)

The infinitive itself does not mean present, past, or future. In the first example, زنگ زدم and بعد از locate the arrival in the past. In the second, purpose follows from برای. Negation can remain inside this nominal package: از نیامدنش ناراحت شدم means “I was upset at his or her not coming.” This compactness is the advantage—and the limitation—of the infinitive.

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If the preposition and main verb already identify the event's time and performer, the infinitive is efficient. Do not add finite morphology merely to repeat recoverable information.

A different participant does not always force a clause

Persian can package a different participant inside a nominal event phrase: قبل از آمدن مهمان‌ها “before the guests' arrival,” پس از پایان یافتن جلسه “after the meeting ended.” Here the phrase behaves much like an event noun. It does not give the participant a finite subject position or independent tense.

پیش از آمدن مهمان‌ها خانه را مرتب کردیم.

pish az âmadan-e mehmân-hâ khâne râ morattab kardim.

We tidied the house before the guests arrived. (neutral; nominal event phrase)

پس از تمام شدن جلسه، کارکنان سالن را ترک کردند.

pas az tamâm shodan-e jalse, kârkonân sâlon râ tark kardand.

After the meeting ended, the staff left the hall. (formal-neutral)

The “same subject = infinitive, different subject = clause” shortcut is therefore useful but incomplete. A simple arrival or ending can be nominalized with its participant. Choose a clause when that participant must act as a full subject with person, contrast, or a separately located event.

Choose اینکه when the embedded situation is a proposition

اینکه turns the following finite clause into a unit that can follow a preposition or serve as a topic. The verb inside the clause carries its own person, tense, aspect, and negation.

از اینکه همسایه‌ها تا دیروقت سروصدا کردند ناراحت بودم.

az in-ke hamsâye-hâ tâ dir-vaqt sar-o-sedâ kardand nârâhat budam.

I was upset that the neighbors made noise until late. (neutral; distinct explicit subject)

قبل از اینکه قطار حرکت کند، درها بسته می‌شوند.

qabl az in-ke qatâr harekat konad, dar-hâ baste mi-shavand.

Before the train departs, the doors close. (formal public information)

تعجب کردم از اینکه هیچ‌کس پیام را ندیده بود.

ta'ajjub kardam az in-ke hich-kas payâm râ nadide bud.

I was surprised that nobody had seen the message. (neutral; past-perfect viewpoint)

The past perfect ندیده بود gives the embedded event a time prior to the speaker's surprise. A bare infinitive cannot express that contrast internally. The broader syntax of finite content clauses is covered on Finite Complement Clauses with که.

Minimal contrast: compact cause versus explicit proposition

از دیر رسیدن ناراحت شدم.

az dir residan nârâhat shodam.

I became upset about arriving late. (compact; normally understood as my own late arrival in this context)

از اینکه راننده دیر رسید ناراحت شدم.

az in-ke rânande dir resid nârâhat shodam.

I became upset that the driver arrived late. (explicit different subject)

The infinitive leaves its actor to control and context; the clause names راننده as a finite subject. English can use about arriving in both cases with a possessive or object pronoun, but Persian often gains clarity by expanding the second into اینکه.

Two ambiguous contexts resolved aloud

بدون گفتن

بدون گفتن رفت most naturally means “he/she left without saying anything,” with the main subject understood for both events. If someone else failed to tell the person, say so in a clause.

بدون اینکه کسی چیزی به او بگوید، از تغییر برنامه باخبر شد.

bedun-e in-ke kasi chizi be u beguyad, az taghyir-e barnâme bâkhabar shod.

Without anyone telling her anything, she learned about the schedule change. (formal-neutral)

بعد از تمام شدن کار

This phrase can mean after “the work was finished” as a nominal event. If the identity of the finisher matters, a finite clause is clearer: بعد از اینکه پیمانکار کار را تمام کرد.

بعد از اینکه پیمانکار تعمیر را تمام کرد، مهندس ساختمان را تحویل گرفت.

ba'd az in-ke peymânkâr ta'mir râ tamâm kard, mohandes sâkhtemân râ tahvil gereft.

After the contractor completed the repair, the engineer accepted the building. (formal; agent made explicit)

Register and processing

Infinitival and other nominalized sequences are frequent in (formal) and (academic) prose because they compress procedures: پس از بررسی مدارک “after reviewing the documents.” They are also entirely normal in conversation when short. A heavy stack of nominal phrases can burden processing; an اینکه clause restores an audible subject and finite verb. Conversational Persian often prefers that clarity.

A third option after selecting verbs

After خواستن، توانستن، باید, Persian ordinarily uses a finite subjunctive without اینکه: می‌خواهم بروم، می‌توانم کمک کنم، باید صبر کنیم. These complements share or control a subject through person endings. Neither می‌خواهم رفتن nor می‌خواهم اینکه بروم is the neutral construction.

Common Mistakes

1. Copying an English infinitive after خواستن

❌ می‌خواهم هفته‌ی بعد به تبریز رفتن.

Incorrect — Persian خواستن selects a finite subjunctive, not the dictionary infinitive.

✅ می‌خواهم فردا با نخستین قطار بروم.

mi-khâham fardâ bâ nokhostin qatâr beravam.

I want to go on the first train tomorrow. (neutral)

2. Putting a bare finite clause after a preposition

❌ قبل از او برسد، در را باز کنید.

Incorrect — a finite clause after قبل از needs اینکه.

✅ قبل از اینکه او برسد، پنجره‌ها را باز کنید.

qabl az in-ke u beresad, panjare-hâ râ bâz konid.

Before she arrives, open the windows. (neutral)

3. Expecting the infinitive to mark past time

❌ از دیروز رسیدن او تعجب کردم.

Incorrect for the intended temporal contrast — the infinitive itself cannot show that his arrival preceded the reaction.

✅ تعجب کردم که او یک روز زودتر رسیده بود.

ta'ajjub kardam ke u yek ruz zud-tar reside bud.

I was surprised that he had arrived one day early. (neutral)

❌ باید اینکه امروز بمانیم.

Incorrect — باید directly licenses a finite subjunctive.

✅ باید امروز تا پایان جلسه بمانیم.

bâyad emruz tâ pâyân-e jalse bemânim.

We must stay until the end of today's meeting. (neutral)

Key Takeaways

Short event after a preposition, with recoverable time and performer: infinitive.
Simple event nominal such as a guest's arrival: infinitive phrase can still name a participant.
Distinct or contrastive subject, independent tense, aspect, propositional polarity, or modality: اینکه clause.
A simple negated event noun such as نیامدن may remain infinitival.
Heavy infinitival phrase that strains comprehension: expand it into a finite clause.
After a modal or control verb such as خواستن: use its selected finite subjunctive, not a long infinitive.

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