The Croatian Instrumental
The instrumental is the case of how and with whom — the tram you ride, the friend beside you, the milk in your coffee. Zagreb runs on it (tramvajem), the islands depend on it (trajektom), and no kava s mlijekom happens without it.
The Shapes
| Gender | Ending | Example |
|---|---|---|
| masculine / neuter | -om | vlak → vlakom, auto → autom, selo → selom |
| masc. after soft consonant | -em | tramvaj → tramvajem, prijatelj → prijateljem |
| feminine | -om | sestra → sestrom, kava → kavom |
The soft consonants that trigger -em are the ones with hooks and glides — j, lj, nj, č, ć, š, ž. Hence tramvajem but vlakom.
Travel: No Preposition
How you travel is bare instrumental — no preposition at all:
| Croatian | English |
|---|---|
| Idem autobusom. | I'm going by bus. |
| Idem vlakom. | I'm going by train. |
| Idemo trajektom na otok. | We're taking the ferry to the island. |
| Idem biciklom. | I'm going by bike. |
Company: s / sa
With people (and milk), the instrumental takes s:
| Croatian | English |
|---|---|
| Pijem kavu s prijateljem. | I'm having coffee with a friend. |
| kava s mlijekom | coffee with milk |
| sa sestrom | with my sister |
| sa šećerom | with sugar |
The s/sa rule: sa appears before s, š, z, ž — the tongue needs the vowel. Everywhere else, plain s.
Idem na more s bratom i sa sestrom.
I'm going to the seaside with my brother and my sister.
Note: s bratom (b is fine bare), sa sestrom (s needs the sa).
Asking: s kim? čim?
S kim? — with whom? Čim? — by what means?
💬 Planning the island trip
Čim idete na Brač?
How are you getting to Brač?
Trajektom iz Splita.
By ferry from Split.
A s kim ideš?
And who are you going with?
S Petrom i s njezinom mačkom. Luna voli more.
With Petra and her cat. Luna loves the sea.
One more instrumental job waits down the road — baviti se sportom (to do sports) — but that's the hobbies lesson's payoff. For now: ride things, accompany people, sweeten coffee.