Use به when a place is the goal of motion and در when it is the setting where something is located or happens. به مدرسه میروم means “I am going to school”; در مدرسه هستم means “I am at school.” The distinction is conceptual—endpoint versus setting—not a mechanical translation of English “to” and “in.”
Two complications matter from the beginning. A motion verb can occur inside a fixed setting, as in “walk in the park,” so motion alone does not force به. Conversely, everyday Persian often omits به with familiar destinations. You must identify the place's role before deciding how it is expressed.
Goal به versus locative در
| Place's role | Core pattern | Question | Example |
|---|---|---|---|
| destination/endpoint | به + place | where to? | به بانک رفتم |
| static location/setting | در + place | where? | در بانک بودم |
| source/start point | از + place | where from? | از بانک آمدم |
صبح به اداره رفتم، اما مدیر آنجا نبود.
sobh be edâre raftam, ammâ modir ânjâ na-bud.
I went to the office in the morning, but the manager was not there. (neutral standard)
امروز در اداره جلسه داریم.
emruz dar edâre jalse dârim.
We have a meeting at the office today. (neutral standard)
بعد از ناهار به موزه میرویم.
ba'd az nâhâr be muze mi-ravim.
After lunch, we are going to the museum. (neutral standard)
دوستم در موزه کار میکند.
dust-am dar muze kâr mi-konad.
My friend works at the museum. (neutral standard)
The same place can appear with either preposition because the clause profiles a different relation. به موزه traces a path ending there; در موزه establishes the scene there.
A moving subject can still be in a location
Walking, running, and driving are motion events, but the place may simply contain the entire event. Compare در پارک دویدم “I ran in the park” with به پارک دویدم “I ran to the park.”
نیم ساعت در پارک قدم زدم.
nim sâ'at dar pârk qadam zadam.
I walked around in the park for half an hour. (the park is the setting)
وقتی باران شروع شد، به ایستگاه دویدیم.
vaqti bârân shoru' shod, be istgâh davidim.
When it started raining, we ran to the station. (the station is the goal)
بچهها در حیاط میدوند.
bachche-hâ dar hayât mi-davand.
The children are running in the yard. (neutral standard)
English “in” and “into” sometimes blur this difference, especially with verbs such as “run” and “walk.” Persian leaves the event type to the verb and uses the prepositional phrase to identify either the scene or endpoint.
Entering and placement use their own frames
Some verbs already encode entering and therefore do not use basic goal به in their most ordinary frame. وارد اتاق شدن means “to enter the room”; اتاق follows وارد through ezâfe in pronunciation: vâred-e otâq shodan. Likewise, a placement verb can take a spatial-noun phrase directly: کتاب را روی میز گذاشتم “I put the book on the table.”
مهمانها یکییکی وارد سالن شدند.
mehmân-hâ yeki-yeki vâred-e sâlon shodand.
The guests entered the hall one by one. (neutral standard)
کفشهایت را کنار در بگذار.
kafsh-hâ-yat râ kenâr-e dar be-gozâr.
Put your shoes beside the door. (neutral standard)
This is why “movement means به” is only a first approximation. Lexical constructions can package the path in the predicate or in a relational phrase. The page on Spatial Nouns with Ezâfe explains placement destinations such as روی میز and کنار در.
When motion verbs omit به
With conventional destinations—especially خانه and institutional or place names—Persian can leave the goal unmarked when the motion verb and context make that role obvious. The pattern occurs in standard Persian too, but it is especially frequent in informal speech.
هر روز دانشگاه میرم و عصر برمیگردم.
har ruz dâneshgâh mi-ram va asr bar-mi-gardam.
I go to university every day and return in the evening. (informal: Tehran)
امشب میریم خونهی مادربزرگ.
emshab mi-rim khune-ye mâdarbozorg.
Tonight we're going to Grandma's house. (informal: Tehran)
The fully explicit versions are هر روز به دانشگاه میروم and امشب به خانهی مادربزرگ میرویم; they suit every register. Omission is not random deletion from every به phrase. It is favored when a conventional destination is interpreted as the obvious endpoint and is particularly common with رفتن “go.” Retaining به is safest in formal prose, but an unmarked conventional destination is not automatically colloquial; surrounding verb forms determine the register.
Some verbs lexically require به even when the goal is abstract: به نتیجه رسیدن “to reach a conclusion,” به کسی اعتماد کردن “to trust someone.” Do not generalize destination omission to these governed complements.
Colloquial تو and توی for location
Everyday Tehran Persian normally uses تو or توی for concrete “inside” location where formal or neutral written Persian uses در. تو is also the independent pronoun “you,” but word order and context distinguish them.
توی آشپزخونهام؛ چای میخوای؟
tu-ye âshpazkhune-am; chây mi-khây?
I'm in the kitchen; do you want tea? (informal: Tehran)
در آشپزخانه هستم؛ چیزی لازم دارید؟
dar âshpazkhâne hastam; chizi lâzem dârid?
I am in the kitchen; do you need anything? (careful spoken standard/polite)
Do not mix the two registers accidentally in controlled writing. توی آشپزخونهام belongs in a message or conversation; در آشپزخانه هستم belongs in standard prose.
A short contrastive exchange
الان کجایی؟
alân kojâ-yi?
Where are you now? (informal)
توی کتابخونهام؛ تا ده دقیقهی دیگه به کافه میام.
tu-ye ketâbkhune-am; tâ dah daqiqe-ye dige be kâfe mi-âm.
I'm in the library; I'll come to the café in ten minutes. (informal: Tehran)
The answer uses توی for the speaker's current setting and retains به for the next destination. Colloquial style does not erase the semantic contrast.
Common Mistakes
1. Using در for a destination
❌ فردا در مدرسه میروم.
Incorrect for ‘I am going to school’ — the school is the endpoint, not the setting.
✅ فردا به مدرسه میروم.
fardâ be madrese mi-ravam.
I am going to school tomorrow.
2. Using به for a static location
❌ امروز به خانه هستم.
Incorrect — with هستم, the house is a location, not a goal.
✅ امروز در خانه هستم.
emruz dar khâne hastam.
I am at home today.
3. Adding به to وارد شدن
❌ مهمان وارد به اتاق شد.
Incorrect — وارد شدن takes its place through ezâfe, without basic goal به.
✅ مهمان وارد اتاق شد.
mehmân vâred-e otâq shod.
The guest entered the room.
4. Omitting the location marker in a formal announcement
❌ جلسهی رسمی سالن اصلی برگزار خواهد شد.
Incorrect in this standard announcement — the venue requires locative در.
✅ جلسهی رسمی در سالن اصلی برگزار خواهد شد.
jalse-ye rasmi dar sâlon-e asli bar-gozâr khâhad shod.
The formal meeting will be held in the main hall. (formal)
Key Takeaways
- Use به for an endpoint and در for a containing location or setting.
- Motion inside a setting still takes در: در پارک دویدم.
- Some path constructions use no به: وارد اتاق شدم، کتاب را روی میز گذاشتم.
- Familiar destinations often omit به in (informal: Tehran) speech, but formal prose generally retains it.
- Concrete locative توی/تو is conversational; در is the standard written choice.
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- در، به، از، با، برایA1 — Use the five core Persian prepositions for location, destination, source, accompaniment, and beneficiary, with clear standard and colloquial contrasts.
- Spatial Nouns with EzâfeA1 — Build Persian location phrases with روی، زیر، کنار، جلوی، and پشت by linking each relational noun to its reference point with ezâfe.
- Source and Separation with ازA2 — Use از for physical sources, separation, comparison, cause, material, information sources, and common verb-governed complements.
- قبل از and بعد ازA2 — Place events before or after noun phrases with قبل از and بعد از, and extend them to finite clauses with اینکه.
- Preposition Drop and Fusion in SpeechB2 — Recognize recoverable goal phrases such as میرم خونه and compact preposition–clitic forms such as بهش، باهاش، and برات in Tehran speech.