The Many Uses of За | Ukrainian Grammar

За is one of the busiest prepositions in Ukrainian, and the reason it feels chaotic at first is that it governs two different cases, and the case decides the meaning. The organising idea is clean once you see it: за + instrumental is static (where something rests — behind, at, busy with), while за + accusative is dynamic or transactional (motion behind something, an exchange, a time-span you cross, a comparison). The same noun gives за столо́м ("at the table," sitting there) and за стіл ("behind / to the table," moving there) — the motion-vs-location switch you have already met. On top of those two, за has a third, narrow use with the genitive meaning "in the era of." This page lays out all three, case by case.

За + instrumental: the static senses

The instrumental is the resting case. After за it gives four related "static" meanings.

'Behind / beyond' — static position

Маши́на стої́ть за до́мом, я її́ зві́дси не ба́чу.

The car is parked behind the house, I can't see it from here.

Мій брат уже́ п’ять ро́ків живе́ за кордо́ном.

My brother has been living abroad for five years now.

За кордо́ном ("abroad," literally "beyond the border") is a fixed everyday phrase — keep it as a chunk, and note its motion partner за кордо́н ("to go abroad," accusative) below.

'At' a table, a desk, a task — engaged with something

Уся́ роди́на вже сиди́ть за столо́м, чека́ють ті́льки на те́бе.

The whole family is already at the table, just waiting for you.

Він ці́лий день за робо́тою — ле́две встига́є пообі́дати.

He's been busy with work all day — he barely manages to have lunch.

The sense is "positioned at / occupied with": за столо́м (at the table), за кермо́м (at the wheel), за робо́тою (at work, busy working), за комп’ю́тером (at the computer). English "at" hides the spatial origin — you are behind the table edge, at the wheel.

'After / following' in sequence

Го́сті захо́дили оди́н за о́дним, кімна́та шви́дко напо́внилася.

The guests came in one after another, and the room filled up quickly.

The pattern оди́н за о́дним ("one after another"), день за днем ("day after day"), крок за кро́ком ("step by step") is a productive instrumental idiom of succession.

'To fetch' — going to get something

Збі́гай, будь ла́ска, за хлі́бом і за молоко́м.

Run out for some bread and milk, please.

This is the standard Ukrainian way to express "go for / go to fetch" — за + instrumental of the thing fetched: піти́ за хлі́бом (go for bread), посла́ти за лі́карем (send for the doctor). It is the correct replacement for the Russian-style "по + accusative" (піти по хліб); for that contrast see the по-preposition page.

За + accusative: the dynamic and transactional senses

The accusative is the case of motion-toward and of objects. After за it gives the "active" meanings.

Motion 'behind / round' something

Він заверну́в за ріг і зник із по́ля зо́ру.

He turned the corner and disappeared from view.

Со́нце вже за́йшло за хма́ри, ста́ло прохоло́дно.

The sun has gone behind the clouds, and it's turned cool.

Compare за ро́гом ("around the corner," location — instrumental) with за ріг ("round the corner," motion — accusative). Same preposition, the case tells you whether you are there or going there. And the motion partner of "abroad": поїхати за кордо́н ("to go abroad," accusative) vs жи́ти за кордо́ном ("to live abroad," instrumental).

'For / in exchange for' — payment, thanks, support

This is one of the highest-frequency uses of all. За + accusative marks what you pay for, thank for, vote for, or get in exchange.

Дя́кую за допомо́гу — без те́бе я б не впо́рався.

Thanks for the help — I couldn't have managed without you.

Скі́льки я ви́нен за ка́ву й тісте́чко?

How much do I owe for the coffee and the pastry?

На ви́борах вона́ голосува́ла за молодо́го кандида́та.

In the election she voted for the young candidate.

So дя́кувати за + accusative (thank for), плати́ти за + accusative (pay for), голосува́ти за + accusative (vote for), вибача́тися за + accusative (apologise for). Notice this за-"for" is transactional — something given in return — distinct from the beneficiary "for" (для + genitive: пода́рунок для те́бе, "a gift for you").

'Within / in' a span of future time

За + accusative measures a stretch of time within which something happens, or after which it will happen — English "in / within."

Я передзвоню́ тобі́ за годи́ну, за́раз тро́хи за́йнятий.

I'll call you back in an hour, I'm a bit busy right now.

Він ви́вчив усю́ те́му за оди́н ве́чір — фено́мен.

He learned the whole topic in a single evening — phenomenal.

There are two shades here. За годи́ну can mean "an hour from now" (after an hour passes) or "within the space of an hour" (it took an hour). Both are за + accusative. Contrast че́рез годи́ну (через + accusative), which means specifically "in an hour from now / after an hour" — the two overlap for future events but за also covers duration-of-completion ("done it in an hour"). The fuller time contrast is on the через/за/про-in-time page.

'By' — grasping a body part or handle

Ма́ма взяла́ дити́ну за́ руку й повела́ через доро́гу.

Mum took the child by the hand and led it across the road.

Він схопи́в валі́зу за ру́чку й побі́г до по́тяга.

He grabbed the suitcase by the handle and ran for the train.

За + accusative of a body part or handle = "by / holding by": взя́ти за́ руку (take by the hand), трима́ти за плече́ (hold by the shoulder). Note the stressed prefix in за́ руку — in this fixed idiom the stress jumps onto за.

The comparative 'than' — a use English speakers always miss

This is the one to underline. За + accusative is one of the two standard ways to say "than" in a comparison (the other being ніж / від). After a comparative adjective or adverb, the thing compared goes in the accusative with за.

Моя́ сестра́ ста́рша за ме́не на три ро́ки.

My sister is three years older than me.

Цей буди́нок ви́щий за всі́ і́нші на ву́лиці.

This building is taller than all the others on the street.

Сього́дні набага́то холодні́ше за вчо́ра.

Today is much colder than yesterday.

So ста́рший за ме́не ("older than me"), бі́льший за стіл ("bigger than the table"), кра́щий за всіх ("better than everyone"). The equivalent with ніж takes the nominative — ста́рша, ніж я — but за is tighter and very common in speech. Full treatment is on the comparative-degree page and the comparative-constructions page.

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За + accusative is a comparison word: after any comparative, 'than X' can be за + accusative — ви́щий за ме́не 'taller than me', холодні́ше за вчо́ра 'colder than yesterday'. This is the easiest 'than' to use because it needs only the accusative and no extra clause. Its rival ніж takes the nominative (ви́щий, ніж я) and is preferred when the two things compared are in different cases.

За + genitive: 'in the era / time of'

The narrowest use. За + genitive sets an action in a historical period — "during the time of, under the reign of."

За часі́в моє́ї ба́бусі лю́ди писа́ли оди́н о́дному до́вгі листи́.

In my grandmother's day, people wrote each other long letters.

За Шевче́нка украї́нську мо́ву жорсто́ко переслі́дували.

In Shevchenko's time, the Ukrainian language was harshly persecuted.

This за + genitive is fixed in phrases like за часі́в (in the times of), за Шевче́нка (in Shevchenko's day), за ра́дянських часі́в (in Soviet times). It is a "temporal frame" sense and does not extend freely — learn the patterns rather than building new ones.

A few high-frequency idioms

За appears welded into common expressions whose meaning you cannot fully derive:

Idiom	Case	Meaning
за́між (ви́йти за́між)	fixed adverb	(to get) married — of a woman
за кордо́н / за кордо́ном	acc / instr	abroad (to go / to live)
за ме́жами	instr	outside / beyond the limits of
за вся́ку ціну́	acc	at any price, by all means
оди́н за о́дним	instr	one after another

Вона́ ви́йшла за́між мину́лого лі́та й переї́хала за кордо́н.

She got married last summer and moved abroad.

Source-language comparison

For an English speaker, за is hard for the same reason по is: it is several English prepositions wearing one coat — behind, at, after, for, within, by, than. The discipline is to read the case: instrumental = static (behind, at, busy with, after), accusative = dynamic/transactional (motion behind, in exchange for, within a time-span, by the hand, and the comparative "than"). The "than" use has no English parallel at all — English never marks comparison with a preposition plus an oblique case — so ста́рший за ме́не must be memorised as a pattern.

For a learner from Russian, за is broadly parallel, including the за стіл / за столо́м motion-location split and the comparative за + accusative. Watch two Ukrainian preferences: "go to fetch" is за + instrumental (за хлі́бом), the correct standard form, and "than" with за is fully native and very common — lean into it rather than defaulting to ніж for every comparison.

Common Mistakes

❌ Сиди́ть за стіл. (accusative for static 'at the table')

Incorrect — static location takes the instrumental: сиди́ть за столо́м. (за стіл = 'sat down at', motion.)

✅ Сиди́ть за столо́м.

He's sitting at the table — за + instrumental, location.

❌ Дя́кую за допомо́гою. (instrumental after 'thank for')

Incorrect — дя́кувати за takes the accusative: дя́кую за допомо́гу.

✅ Дя́кую за допомо́гу.

Thanks for the help — за + accusative.

❌ ста́рший за мене́ю / за мно́ю (instrumental for 'than me')

Incorrect — the comparative 'than' is за + accusative: ста́рший за ме́не.

✅ ста́рший за ме́не

older than me — за + accusative in comparison.

❌ Зроблю́ це за годи́ні. (locative for 'in an hour')

Incorrect — the future time-span 'in an hour' is за + accusative: за годи́ну.

✅ Зроблю́ це за годи́ну.

I'll do it in an hour — за + accusative, time-span.

❌ взяла́ за руки́ (genitive) дити́ну

Incorrect — 'by the hand' is the fixed accusative idiom за́ руку, with stressed за: взяла́ за́ руку.

✅ взяла́ за́ руку

took by the hand — за + accusative, fixed idiom.

Key Takeaways

За governs two cases, and the case carries the meaning: instrumental = static (за столо́м 'at the table', за кордо́ном 'abroad', оди́н за о́дним, за хлі́бом 'for bread'), accusative = dynamic/transactional.
За + accusative covers motion behind (за ріг), 'for / in exchange' (дя́кую за…, плати́ти за…, голосува́ти за…), a future time-span (за годи́ну, за ти́ждень), and 'by' a body part (за́ руку).
The use English speakers always miss: за + accusative is the comparative 'than' — ста́рший за ме́не, ви́щий за всіх.
The motion-location split за стіл / за столо́м is the same case switch that runs through the whole system.
A third, narrow use: за + genitive = 'in the era of' (за часі́в, за Шевче́нка) — fixed phrases, not productive.

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