Which Aspect? Imperfective vs Perfective | Croatian Grammar

Almost every Croatian verb comes as a pair: an imperfective member and a perfective member that mean the same thing but view the action differently. Čitati and pročitati both mean „read"; pisati and napisati both mean „write". The imperfective looks at the action from the inside — as a process unfolding, a habit, an ongoing scene. The perfective looks at it from the outside, as a whole — a single bounded event with a result. This page is a quick chooser: given the situation, which member do you reach for? Each rule below comes with a contrastive pair so you can feel the difference, not just read it. For the underlying theory see the aspect overview; for the fuller decision tree see choosing the aspect.

The one question that decides most cases

Before reaching for a rule, ask: am I reporting a completed result, or a process / habit / ongoing scene?

Completed result, a single whole event → perfective
Process, repetition, habit, or a scene in progress → imperfective

Situation	Aspect	Example
Finished it, there's a result	perfective	Pročitao sam knjigu.
Was busy doing it / used to do it	imperfective	Čitao sam knjigu.
Happening right now	imperfective only	Čitam knjigu.
A command to do it once	perfective	Pročitaj ovo!
A prohibition	imperfective	Nemoj čitati!

Sinoć sam pročitao cijeli roman.

Last night I read a whole novel. — perfective 'pročitati': one bounded, completed event with a result.

Sinoć sam čitao u krevetu dok nisam zaspao.

Last night I was reading in bed until I fell asleep. — imperfective 'čitati': an ongoing process, no stated finish.

Completed result → perfective

If the action reached its endpoint and produced an outcome — you finished, you arrived, you wrote the whole thing — use the perfective. This is the aspect of „got it done".

Napisala sam mu poruku i poslala je.

I wrote him a message and sent it. — two perfectives: each act completed, with a result.

Konačno sam riješio taj problem.

I finally solved that problem. — perfective 'riješiti': the problem is now solved.

Process, habit, ongoing → imperfective

If you are describing the activity itself — what was going on, what you do regularly, what was unfolding — use the imperfective. No endpoint is in view.

Svako jutro pijem kavu na balkonu.

Every morning I drink coffee on the balcony. — imperfective 'piti': a habit, repeated action.

Pisao sam taj rad tri tjedna.

I was writing that paper for three weeks. — imperfective 'pisati': duration of the process; 'napisao' would claim it's finished.

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A duration phrase like tri sata („for three hours") or cijeli dan („all day") almost always wants the imperfective, because it measures the stretch of the process: Učio sam tri sata („I studied for three hours"). A point-in-time result wants the perfective: Naučio sam to za tri sata („I learned it in three hours" — and now I know it).

Present time „right now" → imperfective only

This is the rule with no exceptions: the perfective has no real present-time meaning. A perfective present-tense form does not say „I am doing it now" — it points to the future or to a hypothetical. So whenever you mean „I'm doing this at this moment", you can only use the imperfective.

Što radiš? — Spremam večeru.

What are you doing? — I'm making dinner. — present-now requires the imperfective 'spremati'.

Upravo izlazim iz kuće, stižem za deset minuta.

I'm just leaving the house, I'll be there in ten minutes. — imperfective for the action in progress now.

A perfective present like spremim or izađem does not mean „I'm preparing / I'm leaving now" — it lands in the future or inside a da-clause (kad spremim večeru „once I've made dinner"). That is why the present tense of a perfective is never the answer to „what are you doing?"

After begin / stop / continue (phase verbs) → imperfective

Verbs that frame a phase of an action — početi („begin"), prestati („stop"), nastaviti („continue") — take the imperfective for the action they frame. The logic is airtight: you can only begin, stop, or continue a process, and a process is imperfective. You cannot „begin to read-it-all-the-way-through" in one bounded gulp.

Počeo je čitati i nije mogao stati.

He started reading and couldn't stop. — phase verb 'početi' takes the imperfective 'čitati'.

Prestani vikati na mene!

Stop yelling at me! — 'prestati' takes the imperfective 'vikati'.

Nastavila je raditi i nakon ponoći.

She kept working even after midnight. — 'nastaviti' + imperfective 'raditi'.

There is no *počeo je pročitati — pairing a phase verb with a perfective is ungrammatical. This is one of the cleanest, most predictable aspect rules in the language.

Commands: positive → perfective, prohibition → imperfective

In the imperative the two aspects split by polarity. A positive command to do something once is normally perfective („do it, finish it"). A prohibition („don't…") is normally imperfective, because you are telling someone not to engage in the activity at all.

Positive command (perfective)	Prohibition (imperfective)
Zatvori prozor! (Close the window!)	Ne zatvaraj prozor! (Don't close the window!)
Pojedi to! (Eat that up!)	Nemoj to jesti! (Don't eat that!)
Reci mi! (Tell me!)	Ne govori mi to! (Don't tell me that!)

Otvori vrata, molim te.

Open the door, please. — positive one-off command: perfective 'otvoriti'.

Nemoj otvarati vrata nikome.

Don't open the door to anyone. — prohibition: imperfective 'otvarati'.

This is a strong tendency, not an absolute law — a positive imperfective command exists when you mean „keep doing it / do it generally" (Čitaj svaki dan! „Read every day!"). The fuller picture is on aspect in the imperative.

Narrative: sequence → perfective chain, background → imperfective

When you tell a story, the two aspects do two different jobs. A sequence of events that moves the plot forward — this happened, then that happened — is a chain of perfectives. The background scene against which those events occur — what was going on, the weather, what people were doing — is imperfective.

Ušao je, skinuo kaput i sjeo za stol.

He came in, took off his coat and sat down at the table. — three perfectives: a sequence of completed events advancing the story.

Padala je kiša, a ljudi su žurili kući.

It was raining, and people were hurrying home. — imperfectives: the standing background scene, not plot-advancing events.

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Picture a film. The perfective events are the cuts — each one a discrete shot that moves the action on. The imperfective background is the continuous footage rolling behind them. „It was raining (imperfective) when he walked in (perfective)" — Padala je kiša kad je ušao — puts both layers in one sentence.

Spavao sam kad je zazvonio telefon.

I was sleeping when the phone rang. — imperfective background 'spavao', perfective interrupting event 'zazvonio'.

Common Mistakes

❌ Što pročitaš? (asking what someone is reading now)

Incorrect — a perfective present can't mean 'right now'; use the imperfective for the action in progress.

✅ Što čitaš?

What are you reading? — imperfective for present-time action.

❌ Počeo je pročitati knjigu.

Incorrect — phase verbs ('početi') take the imperfective; you can only begin a process.

✅ Počeo je čitati knjigu.

He started reading the book.

❌ Nemoj zatvoriti prozor.

Dispreferred — a prohibition normally takes the imperfective.

✅ Nemoj zatvarati prozor.

Don't close the window.

❌ Pisao sam pismo i odmah ga poslao. (meaning: I wrote the whole letter, then sent it)

Mismatch — for a completed result the perfective 'napisao' is wanted; imperfective 'pisao' describes only the process.

✅ Napisao sam pismo i odmah ga poslao.

I wrote the letter and sent it right away. — two completed events.

Key Takeaways

The master question: completed whole-event result → perfective; process / habit / ongoing scene → imperfective.
Present time „now" is imperfective only — the perfective present points to the future, never to the moment of speaking.
Phase verbs (početi, prestati, nastaviti) always take the imperfective — you can only begin/stop/continue a process.
Commands split by polarity: positive one-off → perfective (Zatvori!); prohibition → imperfective (Nemoj zatvarati!).
In narrative, chain perfectives for the events that advance the story and use imperfectives for the background scene (Padala je kiša kad je ušao).

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