Most of the time you meet the dative as the indirect object ("give to her") or the experiencer ("to me it's cold"). But the dative is also the case demanded by two very common prepositions: к/ко and по. The first is fairly tidy — it means "toward" something or "to" a person. The second, по, is one of the hardest-working prepositions in the entire language: it covers motion along a surface, regular repetition, means of communication, and "according to / on the subject of," where English would use half a dozen different words. Because по is so frequent, getting comfortable with по + dative unlocks a huge amount of natural Russian at once.
К / ко — "toward, to (a person or destination)"
К (spelled ко before certain consonant clusters: ко мне, ко всем) means motion toward a point, or to a person. It is the answer to к кому́? / к чему́? ("to whom? to what?"). Crucially, when you go to a person — a doctor, a friend, your parents — Russian uses к + dative, not "to + place":
Я иду́ к врачу́.
I'm going to the doctor's. — к + dative врачу́. You go 'toward the doctor (as a person)', not 'to a clinic'.
Приходи́ к нам в го́сти в суббо́ту.
Come over to our place on Saturday. — к нам ('to us') + the idiom в го́сти ('as a guest').
Подойди́ к окну́ — там краси́вый зака́т.
Come up to the window — there's a beautiful sunset. — подойти́ к + dative окну́: approach up to a point.
К for time ("toward / by") and fixed expressions
К also expresses a deadline or approaching point in time — "by, toward" — and lives inside several frozen expressions:
Я зако́нчу рабо́ту к пя́тнице.
I'll finish the work by Friday. — к + dative пя́тнице marks the deadline.
К ве́черу ста́ло прохла́дно.
Toward evening it turned cool. — к ве́черу, 'as evening approached'.
К сожале́нию, я не смогу́ прийти́.
Unfortunately, I won't be able to come. — к сожале́нию is a frozen sentence adverb; also к сча́стью ('fortunately'), к приме́ру ('for example').
По — the most polysemous preposition in Russian
По takes the dative in nearly all its everyday meanings. English splits its functions across "along," "around," "on," "by," "according to," "about," and "per" — but in Russian it is one word governing one case. Below are the main senses; expect to meet all of them in ordinary speech.
1. Motion along / around / over a surface
This is the spatial core: moving along a line or around/over an area. Compare it with в/на + accusative, which mark a destination — по marks the path or the territory covered, not the endpoint.
Мы до́лго гуля́ли по го́роду.
We strolled around the city for a long time. — по го́роду = wandering over the area, with no single destination.
Не бе́гай по коридо́ру!
Don't run in the hallway! — по коридо́ру: motion up and down along the surface.
По реке́ плыву́т ло́дки.
Boats are floating down the river. — по реке́: movement along the watercourse.
2. "On (days), regularly" — the repetition meaning
A favourite of learners because it is so useful: по + dative plural means "every / on (regularly)." This is how you say "on Mondays," "in the mornings," "on weekends" as recurring events.
По понеде́льникам у меня́ йо́га.
On Mondays I have yoga. — по понеде́льникам (dative pl) = every Monday, a recurring routine.
По утра́м я пью ко́фе, а по вечера́м — чай.
In the mornings I drink coffee, and in the evenings tea. — по утра́м / по вечера́м, habitual times of day.
Музе́й закры́т по понеде́льникам.
The museum is closed on Mondays. — the recurring 'every Monday' sense again.
3. Means of communication / transmission — "by, over"
По + dative is the standard way to say something happens by or over a medium: by phone, by mail, over the internet, on the radio, on TV.
Дава́й поговори́м по телефо́ну ве́чером.
Let's talk on the phone this evening. — по телефо́ну = by/over the phone.
Я отпра́вил докуме́нты по по́чте.
I sent the documents by mail. — по по́чте; similarly по интерне́ту, по электро́нной по́чте.
Об э́том передава́ли по ра́дио и по телеви́зору.
They reported it on the radio and on TV. — по ра́дио, по телеви́зору.
4. "According to / by / on the subject of"
По + dative covers "according to (a plan, an opinion)," "by (a rule)," and the subject area of a study, exam, or specialist. English needs "according to," "in," "on," and "of" for these.
Всё идёт по пла́ну.
Everything is going according to plan. — по пла́ну.
По мо́ему мне́нию, э́то оши́бка.
In my opinion, this is a mistake. — по + dative мне́нию; the shorter по-мо́ему means the same.
За́втра у меня́ экза́мен по фи́зике.
I have a physics exam tomorrow. — экза́мен по фи́зике: the subject of the exam takes по + dative.
Она́ специали́ст по дре́вней исто́рии.
She's a specialist in ancient history. — специали́ст по + dative names the field.
The same sense produces учи́тель по матема́тике (a math teacher), кни́га по программи́рованию (a book on programming), and тре́нер по пла́ванию (a swimming coach) — wherever English says "of / on / in" for a field, Russian reaches for по + dative.
5. Distribution — "X each / one apiece"
По also distributes a quantity over recipients — "two each," "one apiece." Here it interacts with numbers: with оди́н it is по одному́ (dative), and this distributive use is one reason по shows up in counting contexts (see numeral government).
Раздай де́тям по конфе́те.
Give the kids one candy each. — по конфе́те (dative sg), distributive 'one apiece'.
Мы заплати́ли по две́сти рубле́й.
We each paid two hundred rubles. — по + the amount, 'each'.
A note on the rarer accusative по
The dative is by far the dominant case after по. There is, however, an older, more limited по + accusative meaning "up to and including (a limit)," found mostly in fixed or bureaucratic phrasing: с понеде́льника по пя́тницу ("from Monday through Friday"), по́ пояс в воде́ ("up to the waist in water"). Treat this as a separate idiom set; in everyday spatial, temporal, and "according-to" senses, по takes the dative.
Магази́н рабо́тает с девяти́ по шесть.
The shop is open from nine to six. — по + accusative шесть marks the upper limit; this is the minority pattern.
How this differs from English
English distributes these meanings across many small words. "Walk along the street," "talk on the phone," "closed on Mondays," "a book on history," "according to the plan," "two each" — six different prepositions. Russian funnels all of them into по + dative. For English speakers the lesson is counterintuitive: you cannot translate the English preposition word-for-word and hope to land on the right Russian one. Instead, learn to recognize the relationship — path, routine, medium, criterion, distribution — and let it trigger по + the dative. Conversely, when you go to a person, English "to" maps onto к + dative, never в/на. These two prepositions are small but they carry an enormous load of ordinary Russian.
Common Mistakes
❌ Я иду́ в врача́.
Incorrect — you go to a *person* with к + dative, not в + accusative.
✅ Я иду́ к врачу́.
I'm going to the doctor. — к + dative врачу́.
❌ Мы гуля́ли по го́род.
Incorrect — по governs the dative, so 'around the city' is по го́роду, not the accusative по го́род.
✅ Мы гуля́ли по го́роду.
We walked around the city. — по + dative.
❌ По понеде́льник у меня́ заня́тия.
Incorrect — 'on Mondays' (recurring) needs the dative PLURAL: по понеде́льникам. A single Monday would be в понеде́льник.
✅ По понеде́льникам у меня́ заня́тия.
On Mondays I have classes. — по + dative plural for a routine.
❌ У меня́ экза́мен в фи́зике.
Incorrect — the subject of an exam takes по + dative, not в.
✅ У меня́ экза́мен по фи́зике.
I have a physics exam. — экза́мен по + dative.
❌ Поговори́м на телефо́не.
Incorrect — 'on the phone' (as a medium) is по телефо́ну; на телефо́не would mean physically on top of the device.
✅ Поговори́м по телефо́ну.
Let's talk on the phone. — по + dative for the medium.
Key Takeaways
- К/ко + dative = motion toward a point or to a person (иду́ к врачу́, подойти́ к окну́), a time deadline (к пя́тнице, к ве́черу), and fixed adverbs (к сожале́нию, к сча́стью).
- Go to a person with к, never в/на. Those are for places.
- По + dative is hugely polysemous: motion along/around a surface (по у́лице), recurring time (по понеде́льникам, по утра́м), medium (по телефо́ну, по ра́дио), "according to / on the subject of" (по пла́ну, по-мо́ему, экза́мен по фи́зике), and distribution (по одному́).
- Recurring day = по + dative plural (по понеде́льникам); a single day = в + accusative (в понеде́льник).
- A rare по + accusative means "up to (a limit)": с понеде́льника по пя́тницу. The dative is the default everywhere else.
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