The Many Uses of За | Russian Grammar

За is the trickiest of Russian's everyday prepositions because it is two-case and its two cases carry genuinely different meanings. The accusative cluster is about motion, exchange, and time spans; the instrumental cluster is about static position, pursuit, and care. The single sharpest trap — and the reason this page exists — is the difference between заплати́ть за хлеб ("pay for bread," accusative) and сходи́ть за хле́бом ("go for bread," i.e. fetch it, instrumental). English says "for" both times; Russian uses za with two different cases. Get the case right and the meaning is unambiguous; get it wrong and you say something else entirely.

За + accusative — motion, exchange, time

Sense	Example	English
motion to behind	сесть за стол	sit down at the table
for / in exchange	заплати́ть за биле́т	pay for the ticket
on behalf of / vote for	голосова́ть за	vote for
within a period	за час	in / within an hour
marry (of a woman)	вы́йти за́муж за	marry (someone)

Motion to behind / to a position

With directed motion, за takes the accusative: you move something to behind or to a place at a table.

Сади́тесь за стол, всё уже́ гото́во.

Sit down at the table, everything's ready. — сесть за + accusative стол: motion to take your place.

Ле́том мы ча́сто е́здим за́ город.

In summer we often go out of town. — за́ город (stress on за): motion 'to beyond the city' = the countryside.

For / in exchange / on behalf of

За + accusative marks what you pay for, thank for, vote for, or do in someone's place. This is the "in exchange / in return" sense.

Спаси́бо большо́е за по́мощь и за сове́т.

Thank you so much for your help and your advice. — спаси́бо за + accusative.

Ско́лько ты заплати́л за э́ти биле́ты?

How much did you pay for these tickets? — заплати́ть за + accusative биле́ты: payment in exchange.

Мы все голосова́ли за э́тот прое́кт.

We all voted for this project. — голосова́ть за + accusative: in favour of.

Within / over a period of time

За + accusative also means in / within / over a stretch of time — how long it took to complete something, or the span reviewed.

Он вы́учил все слова́ за час.

He learned all the words in an hour. — за час: the whole task done within that span. (Contrast че́рез час = 'an hour from now'.)

За после́дние го́ды мно́гое измени́лось.

A lot has changed over the past few years. — за + accusative for the period reviewed.

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Two time uses are easy to confuse: за час (accusative) = "within an hour, in the span of an hour" (a completed action); че́рез час (accusative, different preposition) = "an hour from now." За час я всё сде́лал = I did it all in an hour; че́рез час я всё сде́лаю = I'll do it all an hour from now.

За + instrumental — location, pursuit, care

Sense	Example	English
location behind / at	за до́мом, за столо́м	behind the house; at the table
after / following	идти́ за мной	follow me
to fetch / for	зайти́ за хле́бом	drop by for bread
in charge of / caring for	следи́ть за детьми́	watch the children

Static location behind / at

With static position — answering где? — за takes the instrumental. За столо́м means at the table (seated, working); за до́мом means behind the house.

Маши́на стои́т за до́мом, во дворе́.

The car is parked behind the house, in the yard. — за + instrumental до́мом: location.

Они́ за́втракают за столо́м на ку́хне.

They're having breakfast at the table in the kitchen. — за столо́м (instrumental) = located at the table.

After / following

За + instrumental means after / following in the sense of going behind someone in motion.

Иди́ за мной, я зна́ю доро́гу.

Follow me, I know the way. — идти́ за + instrumental мной: moving behind/after.

To fetch / "for" — the instrumental "for"

This is the high-value contrast. За + instrumental means to go and get / fetch something — to drop by for bread, send for a doctor. English "for" here is the instrumental, not the accusative.

Зайди́ в магази́н за хле́бом и молоко́м.

Stop by the shop for bread and milk. — зайти́ за + instrumental хле́бом: to fetch. (Заплати́ть за хлеб, by contrast, is accusative.)

На́до сро́чно посла́ть за врачо́м.

We need to send for a doctor immediately. — посла́ть за + instrumental врачо́м: to fetch the doctor.

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The "for" trap in one line: заплати́ть за хлеб (accusative) = "pay FOR bread"; сходи́ть за хле́бом (instrumental) = "go FOR / fetch bread." If you can replace "for" with "in exchange for," use the accusative; if you can replace it with "to fetch / to get," use the instrumental.

In charge of / looking after

За + instrumental also means to keep an eye on / look after / be in charge of — watching children, caring for the sick, following the news.

Ты мо́жешь присмотре́ть за детьми́ час?

Can you watch the kids for an hour? — следи́ть/смотре́ть за + instrumental детьми́: care, supervision.

Она́ до́лго уха́живала за больно́й ма́терью.

She looked after her sick mother for a long time. — уха́живать за + instrumental: caring for.

The distinguishing insight: case picks the meaning

За is the clearest demonstration in Russian that the case ending, not the preposition, carries the meaning. The preposition за tells you nothing on its own — you must hear the case:

за стол (accusative) = sit down at the table (motion) · за столо́м (instrumental) = at the table (location)
за хлеб (accusative) = for bread, i.e. pay for it · за хле́бом (instrumental) = for bread, i.e. fetch it
за дом (accusative) = to behind the house (motion) · за до́мом (instrumental) = behind the house (location)

The accusative-vs-instrumental split for motion/location is the same logic you saw with под (instrumental prepositions) and the accusative за of accusative prepositions.

Common Mistakes

❌ Я заплати́л за биле́том.

Wrong — 'pay for' is за + accusative (за биле́т). За биле́том (instrumental) means 'to fetch the ticket'.

✅ Я заплати́л за биле́т.

I paid for the ticket. — за + accusative = in exchange.

❌ Сходи́ в магази́н за хлеб.

Wrong — 'go fetch bread' is за + instrumental (за хле́бом). За хлеб (accusative) means 'for bread' as in paying.

✅ Сходи́ в магази́н за хле́бом.

Go to the shop for bread (to fetch it). — за + instrumental.

❌ Они́ сидя́т за стол.

Wrong for being seated — that's location, so instrumental: за столо́м. За стол (accusative) is the motion 'sit down'.

✅ Они́ сидя́т за столо́м.

They are sitting at the table. — за + instrumental for location.

❌ Присмотри́ за дете́й.

Wrong — 'look after the children' is за + instrumental: за детьми́, not the accusative за дете́й.

✅ Присмотри́ за детьми́.

Look after the children. — за + instrumental for care/supervision.

❌ Он вы́учил слова́ че́рез час, сидя́ до́ма.

Wrong if you mean 'within an hour' — that's за час. Че́рез час means 'an hour from now'.

✅ Он вы́учил слова́ за час.

He learned the words in an hour. — за + accusative for the span.

Key Takeaways

За is two-case. Accusative = motion / exchange / time span; instrumental = location / pursuit / care.
За + accusative: motion to behind (сесть за стол), "for / in exchange" (заплати́ть за биле́т, спаси́бо за по́мощь, голосова́ть за), "within a period" (за час, за после́дние го́ды).
За + instrumental: location behind/at (за до́мом, за столо́м), "after/following" (идти́ за мной), "to fetch" (зайти́ за хле́бом, посла́ть за врачо́м), "in charge of / caring for" (следи́ть за детьми́).
The "for" test: "in exchange for" → accusative (за хлеб); "to fetch" → instrumental (за хле́бом).
Time: за час = within an hour (completed); че́рез час = an hour from now.

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