služiti (to serve) | Croatian Grammar

Služiti ("to serve") is the verb where one English word splinters into three separate Croatian constructions, each with its own case government. You serve a person (the waiter, your country) in the dative; an object is used for something with za + accusative (the Čemu to služi? "what's that for?" idiom); and when you make use of a tool, you reach for the reflexive služiti se + instrumental (služiti se rječnikom "use a dictionary"). English collapses "serve", "is for", and "use" into overlapping vocabulary; Croatian keeps them apart by case, so the case ending is the meaning. Getting this right is the whole point of the page.

Aspect

Služiti is imperfective (služim) — it describes serving as an ongoing state or activity. Its perfective partner depends on the sense: poslužiti ("to serve up, to wait on" — bring food/drink, attend to a guest) is the everyday perfective; poslužiti se is the reflexive perfective ("to help oneself"). For the "be used for" sense there is no natural perfective — služiti za describes a standing function, which is inherently durative.

Verb	Aspect	Present 1sg	Typical use
služiti	imperfective	služim	serve someone; be used for; (refl.) make use of
poslužiti	perfective	poslužim	wait on / serve up (a single act)
poslužiti se	perfective (refl.)	poslužim se	help oneself (to food etc.)

💡

One verb, three case frames — keep them physically separate in your head: dative = serve a person/cause, za + accusative = be used for X, se + instrumental = use a tool. If you can swap in "make use of", it's the reflexive-instrumental frame.

Present tense

A regular i-class verb: stem služ- + i-class endings.

Person	Form	Meaning
ja	služim	I serve
ti	služiš	you serve
on/ona/ono	služi	he/she/it serves
mi	služimo	we serve
vi	služite	you serve
oni/one/ona	služe	they serve

Čemu služi ovaj gumb?

What's this button for? — the 'Čemu služi?' idiom: za-sense in the dative-question form 'čemu'.

The l-participle

Gender / number	Form
masculine singular	služio
feminine singular	služila
neuter singular	služilo
masculine plural	služili
feminine plural	služile
neuter plural	služila

The masculine singular služio shows the vocalised -l (-io), regular for an -iti verb.

Perfect tense (perfekt)

Clitic biti + l-participle.

Person	Masculine subject	Feminine subject
ja	služio sam	služila sam
ti	služio si	služila si
on / ona	služio je	služila je
mi	služili smo	služile smo
vi	služili ste	služile ste
oni / one	služili su	služile su

Djed je služio vojsku u Puli.

Grandpa did his military service in Pula. — 'služiti vojsku' = do one's military service, a fixed collocation with the accusative.

Future I (futur prvi)

The infinitive drops its final -i before the clitic: služit ću.

Person	Form
ja	služit ću
ti	služit ćeš
on/ona/ono	služit će
mi	služit ćemo
vi	služit ćete
oni/one/ona	služit će

Ova prostorija služit će kao spremište.

This room will serve as a storeroom. — 'služiti kao' + nominative for 'serve as'.

Imperative

The reflexive služi se! ("help yourself!") is the form you will actually hear at a Croatian table; the bare posluži se! (perfective) is even more common as a one-off invitation.

Person	služiti	poslužiti se (refl. pf)
ti	služi	posluži se
mi	služimo	poslužimo se
vi	služite	poslužite se

Posluži se kolačima, ima ih dovoljno.

Help yourself to the cakes, there are plenty. — reflexive + instrumental 'kolačima'.

Conditional I (kondicional prvi)

The bih-clitics + l-participle.

Person	Form (masc.)
ja	služio bih
ti	služio bi
on/ona/ono	služio / služila / služilo bi
mi	služili bismo
vi	služili biste
oni/one/ona	služili bi

Other forms

Passive participle: služen ("served"), mostly in the food sense — Ručak je služen u podne ("Lunch was served at noon"). The derived noun služba ("service, duty, post") and usluga ("a service/favour") are everyday vocabulary worth knowing.
Present verbal adverb: služeći ("[while] serving") — Zaradio je dovoljno služeći u restoranu ("He earned enough working/serving in the restaurant").

Key uses and government

This is the core of the verb. Three frames, three cases — never interchangeable.

1. služiti + dative — "serve someone / something"

To serve a person, an institution, or a cause, use the bare dative — no preposition, where English has a bare object ("serve the king") or "serve in/at". This is the dative of the entity benefiting from the service. See the dative with verbs and adjectives.

Cijeli je život služio domovini.

He served his country his whole life. — dative 'domovini', no preposition.

Konobar je ljubazno služio gostima.

The waiter served the guests politely. — dative 'gostima'.

2. služiti za + accusative — "be used for / serve to"

When the subject is a thing and you state its function, use za + accusative: "it serves for cutting", "what is this for". The question word is the dative čemu ("to what end"), which is why the idiom is Čemu (to) služi? even though the answer comes back with za + accusative.

Ovaj nož služi za rezanje kruha.

This knife is for cutting bread. — 'za' + accusative (the verbal noun 'rezanje').

Čemu služi ova aplikacija?

What's this app for? — the 'Čemu služi?' idiom, dative interrogative 'čemu'.

Ne znam čemu to uopće služi.

I don't even know what that's for. — 'čemu' as the indirect question.

3. služiti se + instrumental — "make use of / use"

When you make use of a tool, method, or language, use the reflexive služiti se + the instrumental. This is a more formal, deliberate "use" than the plain koristiti (se); you služiš se rječnikom (use a dictionary), služiš se mišem (use the mouse), služiš se stranim jezikom (use a foreign language). The instrumental here is the instrumental of means — the tool through which the action is done. See the instrumental forms and the se-construction.

Smijem li se služiti rječnikom na ispitu?

May I use a dictionary on the exam? — reflexive 'služiti se' + instrumental 'rječnikom'.

Dobro se služi engleskim i talijanskim.

She has a good command of English and Italian. — instrumental of the languages used.

4. služiti vs koristiti — "use"

For the everyday "use", koristiti (se) is more frequent and less formal than služiti se. The crucial trap: koristiti takes the accusative (koristim rječnik), but reflexive služiti se takes the instrumental (služim se rječnikom). See koristiti.

Koristim rječnik svaki dan.

I use a dictionary every day. — 'koristiti' + accusative 'rječnik' (contrast 'služim se rječnikom').

Common Mistakes

❌ Služim se rječnik.

Wrong case — reflexive 'služiti se' governs the instrumental, not the accusative: 'rječnikom'.

✅ Služim se rječnikom.

I use a dictionary.

❌ Ovaj nož služi rezanje.

Missing 'za' — the function sense needs 'za' + accusative: 'služi za rezanje'.

✅ Ovaj nož služi za rezanje.

This knife is for cutting.

❌ Služio je domovinu cijeli život.

Wrong case — serving a person/cause takes the bare dative: 'služio je domovini'.

✅ Služio je domovini cijeli život.

He served his country his whole life.

❌ Za što služi ovaj gumb?

Unidiomatic — the natural 'what for' uses the dative interrogative 'čemu': 'Čemu služi ovaj gumb?'

✅ Čemu služi ovaj gumb?

What's this button for?

❌ Poslužite kolačima.

Wrong voice — to invite a guest to help themselves you need the reflexive: 'Poslužite se kolačima.'

✅ Poslužite se kolačima.

Help yourselves to the cakes.

Key Takeaways

služiti (impf, služim, služio); perfective poslužiti / reflexive poslužiti se.
služiti + dative = serve a person or cause (služiti domovini) — bare dative, no preposition.
služiti za + accusative = be used for (služi za rezanje); the idiom is Čemu služi? with the dative interrogative čemu.
služiti se + instrumental = make use of a tool/language (služiti se rječnikom) — contrast koristiti
- accusative.
Posluži se! / Poslužite se! = "help yourself / yourselves" — what you'll hear at a Croatian table.

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