Start with the single idea the whole topic hangs on: in Bosnian a preposition governs a case. That means the noun after it cannot stay in its dictionary shape — the nominative, the form you find in a word list — but has to take the ending the preposition demands. So grad (city) is the bare nominative, but “from the city” is od grada, with the genitive ending -a; od grad is simply wrong, the way “from the city” could never be “from city” in careful English. You are not choosing a case each time by meaning — the preposition has already chosen it for you. Your job is to learn which preposition pulls which case, and Bosnian is kind enough to sort them into a few tidy groups.
Bosnian, Croatian, Serbian and Montenegrin share the core preposition-and-case system, so the main patterns here travel well across the four closely related standards. Preferred forms and frequency can still differ. The examples below use Bosnian spelling, which is ijekavian: you will see rijeka (river), mlijeko (milk) and prije (before) where Serbian often writes reka, mleko and pre.
The one that trips everyone: u and na
If you learn only one thing today, learn this pair. U (“in / into”) and na (“on / onto / to”) are two of the most common prepositions in the language, and each takes two different cases depending on what you mean. The split is logical once you see it: movement toward a place takes the accusative (the case also used for a direct object); being at a place takes the locative (a case used only after prepositions, for location here and for topics after words such as o, “about”).
| You mean | Question | Case | Example |
|---|
| motion toward | Kuda? (where to?) | accusative | Idem u grad. — I'm going into town. |
| where you are | Gdje? (where?) | locative | Živim u gradu. — I live in town. |
| motion toward | Kuda? | accusative | Idem na Baščaršiju. — I'm going to Baščaršija. |
| where you are | Gdje? | locative | Na Baščaršiji sam. — I'm at Baščaršija. |
Look at what changes: grad → u grad (accusative, same as the nominative for this word) when you set off, but u gradu (locative, with -u) once you have arrived. The feminine Baščaršija — Sarajevo's old bazaar quarter — becomes na Baščaršiju going there and na Baščaršiji being there. The preposition is identical; only the ending tells the listener whether you are on your way or already settled. English leans on the verb to carry that difference; Bosnian carries it in the noun. If the case names are new, our guides to the accusative and the locative unpack the endings at a gentler pace.
A small mercy: na is the right word for far more than flat surfaces. It covers islands (na Hvar), events and errands (na posao — to work, na kafu — out for coffee), and open or boundary-less places, while u handles anything you go into — a town, a building, a country (u Bosnu — to Bosnia). When you are unsure which of the two to reach for, think about whether the place has an inside you step into (u) or a surface or occasion you go onto or out to (na).
The genitive crowd
The genitive — the “of / from” case — follows a large, useful cluster of everyday prepositions. That makes the group worth learning early, but it is not a licence to guess: learn each preposition together with the case it governs.
| Preposition | Meaning | Example |
|---|
| od | from / since | od Sarajeva — from Sarajevo |
| do | up to / as far as | do Mostara — to Mostar |
| iz | out of / from | iz Bosne — from Bosnia |
| kod | at someone's place / by | kod Amira — at Amir's |
| bez | without | bez šećera — without sugar |
| prije / poslije | before / after | prije ručka — before lunch |
| oko / blizu | around / near | blizu rijeke — near the river |
The same case quietly handles the little words of position — the ones you need to say where the keys actually are: ispred (in front of), iza (behind), iznad (above), ispod (below), pored (beside) and između (between). All of them, too, take the genitive: ispred kuće (in front of the house), između Sarajeva i Mostara (between Sarajevo and Mostar). Order a coffee the Bosnian way and you are already using this case twice over — kafa bez mlijeka, coffee without milk. For the endings themselves, the genitive, made easy is the companion piece.
The smaller crews: accusative, dative and instrumental
Three shorter lists finish the picture. A small set of prepositions takes the accusative on its own, usually for movement through or along something: kroz (through — kroz grad, through town), niz (down — niz ulicu, down the street) and uz (up / alongside — uz rijeku, up the river).
Prema (toward / according to — prema Sarajevu) takes the dative, the “to / toward” case. You may also meet k or ka with the dative; the cited comparative grammar notes that this use is especially characteristic of Croatian, so Bosnian learners should recognise it rather than treat it as the default way to say “toward”. You will meet the dative far more often without prepositions, especially with people; our dative guide has the rest.
Finally, the instrumental — the “with / by means of” case — is headed by s (or sa), meaning “with”. Kafa sa šećerom is coffee with sugar; idem s prijateljem is I'm going with a friend. (The longer form sa turns up before tricky sounds — sa šećerom, sa mnom “with me” — to make the phrase pronounceable.) The position words nad (above), pod (under), pred (in front of) and među (among) take the instrumental for a static location, but switch to the accusative for motion into that position: compare pod stolom (under the table) with staviti pod stol (put under the table). The instrumental, explained shows how the endings work.
Screenshot this — prepositions by case:
- Genitive: od, do, iz, kod, bez, prije, poslije, oko, blizu + ispred, iza, iznad, ispod, pored, između
- Accusative (fixed set): kroz, niz, uz
- Dative: prema; recognise k / ka, especially in Croatian usage
- Instrumental: s / sa (“with”); nad, pod, pred, među for static position
- Accusative or instrumental: nad, pod, pred, među — accusative for motion into position, instrumental for location
- Accusative or locative: u, na — accusative for motion, locative for location
Two honest footnotes, for when you start reading real Bosnian. Beyond the motion/location alternation above, some prepositions keep a second job with a different case: s(a) plus the genitive can mean “down from / off” (sa stola, off the table) rather than “with”, and za means “for” with the accusative (za tebe, for you) but “behind” with the instrumental (za kućom, behind the house). You do not need to drill these on day one — just learn each preposition together with its meaning and case instead of guessing from the size of a case group.
A real exchange, cases and all
Here is how naturally this works once the groupings are in your ear — four lines, five prepositions, every noun quietly in the case its preposition asked for:
Amir: Ideš li u grad? — Are you going into town? (u + accusative — motion)
You: Da, na kafu kod Emine. — Yes, out for coffee at Emina's. (na + acc, kod + genitive)
Amir: Je li to blizu Baščaršije? — Is that near Baščaršija? (blizu + genitive)
You: Jeste. Popij kafu s nama! — It is. Have a coffee with us! (s + instrumental)
Nobody in that exchange stopped to parse a case. They reached for the preposition the meaning called for, and the ending came with it — because the two travel together. That is the habit to build: learn the preposition and its case as one unit, the way you learned “from the city” as a phrase, not two separate words. A friendlier opener than Ideš li… lives in our Bosnian greetings, and if the whole business of masculine, feminine and neuter endings still feels shaky, noun gender made simple is the piece to read next.
Try it (answers below)
Cover the answers and build the Bosnian:
- Say “I'm going into town” — motion, so which case after u?
- Say “I live in Sarajevo” — you're staying put.
- Say “coffee without sugar”.
Answers: 1) Idem u grad. (accusative) 2) Živim u Sarajevu. (locative) 3) kafa bez šećera. (genitive)
Quick questions
Do prepositions change the case of the noun in Bosnian? Yes. Every Bosnian preposition governs a case: it forces the noun after it out of the dictionary (nominative) form into the genitive, dative, accusative, locative or instrumental. Od grad is wrong; od grada (from the city) is right.
When do u and na take the accusative, and when the locative? Use the accusative after u and na for motion toward a destination — Idem u grad (I am going into town), Idem na posao (I am going to work). Use the locative for a fixed location — Živim u gradu (I live in town), Ja sam na poslu (I am at work).
Which Bosnian prepositions take the genitive? A large group takes the genitive: od (from), do (up to), iz (out of), s or sa (off), kod (at someone's place) and bez (without), plus position words including ispred, iza, iznad, ispod, pored and između. Learn each preposition together with its case; other common prepositions require the accusative, dative, locative or instrumental.
Are prepositions and cases the same in Bosnian, Serbian and Croatian? The core preposition-and-case system is shared across Bosnian, Croatian, Serbian and Montenegrin, so the main patterns transfer. Preferred forms and frequency can differ — k or ka with the dative, for example, is especially characteristic of Croatian — and Bosnian uses ijekavian forms such as prije and poslije where Serbian often has pre and posle.
Prepositions are where Bosnian grammar stops feeling like a pile of endings and starts feeling like a system: a short word tells you the case before you have even reached the noun. Get the u-and-na motion-versus-place switch into your ear, then learn each preposition together with its meaning and case instead of guessing from the largest group. If you want them drilled into real conversations — with a patient fox who nudges you when u grad should have been u gradu — that is exactly what Gora is built for. Bosnian is live today: there's a free seven-day trial with no card, and you can search “Gora Academy” in the Apple App Store or on Google Play. The beginner's guide to learning Bosnian shows where prepositions sit in the bigger journey.
PS — the one move to practise first? The switch. Say idem u grad, then živim u gradu, out loud, and feel the ending change as the meaning does.