By now you know the typical aspect pair: one base verb (čitati) and a prefixed or suffixed partner (pročitati) that share an obvious family resemblance. Most pairs work that way, and the pair-formation pages show the machinery. But two groups of high-frequency verbs break the pattern, and they trip up learners precisely because they are so common. Suppletive pairs use two completely unrelated words for the two aspects — there is no shared stem to spot. Bi-aspectual verbs go the other way: a single form does duty for both aspects, and only the sentence tells you which one is meant. Both groups have to be learned as exceptions, but each comes with a usefully predictable core.
Suppletive pairs: two different words, one meaning
A suppletive pair is one where the imperfective and the perfective do not derive from each other at all — they are separate roots that the language has yoked together to do one job. English has the same phenomenon outside of verbs: good / better, go / went. There is no rule that turns go into went; you simply memorise the pair. Croatian has a small set of extremely frequent verbs that work this way.
The single most important one is the verb for "say / speak / talk":
| Imperfective | Perfective | Meaning |
|---|---|---|
| govoriti | reći | say, speak, tell |
| uzimati | uzeti | take |
| dolaziti | doći | come, arrive |
| stavljati | staviti | put, place |
| nalaziti | naći | find |
| kupovati | kupiti | buy |
| hvatati | uhvatiti | catch |
Notice that the last two are only partly suppletive — kupovati / kupiti and hvatati / uhvatiti share a recognisable root even though the shapes diverge a lot. The truly suppletive ones, where you would never guess the partner, are the top five: govoriti / reći, uzimati / uzeti, dolaziti / doći, stavljati / staviti, nalaziti / naći.
govoriti / reći — the pair that surprises everyone
This is the one to drill first. Govoriti is the imperfective — talking as an activity, an ability, a habit, an ongoing flow of speech. Reći is the perfective — saying one thing, getting one statement out, telling someone a single piece of information.
Govorim hrvatski već dvije godine.
I've been speaking Croatian for two years now. — ongoing ability: imperfective govoriti.
Reci mi istinu.
Tell me the truth. — one completed act of saying: perfective reći.
Profesor je govorio sat vremena.
The professor talked for an hour. — duration, a process: govoriti.
Htio sam ti nešto reći, ali sam zaboravio.
I wanted to tell you something, but I forgot. — one thing to say: reći.
The instinct of an English speaker — or of someone over-applying the prefix rule — is to look for a prefixed perfective of govoriti, something like *progovoriti. That word does exist, but it does not mean the plain perfective "say". Progovoriti means "to start speaking / to break into speech" (a child progovori when it first learns to talk). The everyday perfective of govoriti is the unrelated word reći. So you must store them together as a pair: govoriti / reći, exactly as you store go / went.
The other frequent suppletives in action
Svako jutro uzimam tramvaj do posla.
Every morning I take the tram to work. — habit: imperfective uzimati.
Uzmi kišobran, vani pada.
Take an umbrella, it's raining out. — one act, now: perfective uzeti (imperative uzmi).
Gosti dolaze u osam.
The guests are coming at eight. — scheduled, ongoing: imperfective dolaziti.
Došli su prije nego što smo bili spremni.
They arrived before we were ready. — single completed arrival: perfective doći.
Stavljam ključeve uvijek na istu policu.
I always put the keys on the same shelf. — habit: imperfective stavljati.
Stavi to na stol i sjedni.
Put that on the table and sit down. — one act: perfective staviti.
Nikako ne mogu naći svoje naočale.
I just can't find my glasses. — a single hoped-for result: perfective naći.
The logic of which member to choose is the ordinary aspect logic — process versus completed whole — covered on the aspect overview. What is special here is only that the words are unrelated, so neither member helps you recall the other. They have to be memorised as a set.
Bi-aspectual verbs: one form, both jobs
The mirror-image problem is the bi-aspectual (dvovidni) verb. Here a single form is used for both the imperfective and the perfective reading, and only the context disambiguates. There is no second word to learn — which is convenient — but it means a single sentence can be genuinely two-ways ambiguous out of context.
The big, productive class: -irati loanwords
The most important fact for a learner is that almost all -irati verbs (and the variants -izirati, -ificirati) are bi-aspectual. These are the borrowed verbs — overwhelmingly international vocabulary — and Croatian absorbed them without building separate aspect pairs. That is a gift: every time you import a modern verb, you get to skip the pairing problem entirely.
| Verb (-irati) | Meaning | Aspect |
|---|---|---|
| organizirati | organise | both |
| telefonirati | phone, call | both |
| definirati | define | both |
| informirati | inform | both |
| kopirati | copy | both |
| analizirati | analyse | both |
Cijeli tjedan organiziram konferenciju.
I'm organising the conference all week. — clearly imperfective: an ongoing process.
Organizirao sam sve do petka.
I had everything organised by Friday. — clearly perfective: completed, with a deadline.
Telefonirala sam mu jučer.
I phoned him yesterday. — one completed call: read as perfective.
Dok sam telefonirala, zvonio je drugi telefon.
While I was on the phone, the other phone was ringing. — ongoing: read as imperfective.
The same form telefonirala serves both. The deadline phrase do petka, the durative cijeli tjedan, the background dok clause — these are what fix the reading. (Croatian also has a native perfective for some of these, e.g. nazvati "to call (someone)" alongside telefonirati, but the bare -irati verb itself remains usable for either aspect.)
A handful of native bi-aspectual verbs
A few inherited Croatian verbs are also bi-aspectual. The most useful to recognise:
| Verb | Meaning | Note |
|---|---|---|
| čuti | hear | both aspects in one form |
| vidjeti | see | largely bi-aspectual; perfective vidjeti / impf viđati for "see repeatedly" |
| ručati | have lunch | both |
| večerati | have dinner | both |
| roditi | give birth to | both (also reflexive roditi se "be born") |
Čuješ li to?
Do you hear that? — a perception happening now: imperfective reading of čuti.
Čuo sam dobre vijesti.
I heard some good news. — one completed perception: perfective reading of čuti.
Obično ručamo oko jedan.
We usually have lunch around one. — habit: imperfective reading of ručati.
Jesi li već ručao?
Have you had lunch already? — completed: perfective reading of ručati.
With vidjeti, watch a subtlety: the bare verb covers the completed "catch sight of / see" but for genuinely repeated seeing, Croatian reaches for a separate imperfective viđati ("Često ih viđam u parku" — "I often see them in the park"). So vidjeti is bi-aspectual for the everyday cases but acquires a dedicated imperfective partner when you specifically mean habitual seeing.
Common Mistakes
❌ Progovori mi što se dogodilo.
Wrong — progovoriti means 'start to speak', not the plain perfective 'tell'.
✅ Reci mi što se dogodilo.
Tell me what happened. — the perfective of govoriti is the suppletive reći.
❌ Govori mi svoje ime.
Odd as a one-off request — the imperfective imperative invites continuous speaking.
✅ Reci mi svoje ime.
Tell me your name. — a single piece of information: perfective reći.
❌ Jučer sam organiziravao zabavu.
Wrong — there is no *organiziravati; the -irati verb is already both aspects.
✅ Jučer sam organizirao zabavu.
Yesterday I organised a party. — bi-aspectual organizirati needs no special perfective.
❌ Uzimam ključ i odlazim odmah.
Mismatched for 'I'll grab the key' — uzimati is the process/habit member.
✅ Uzet ću ključ i odlazim odmah.
I'll grab the key and head out right away. — one act: perfective uzeti.
❌ Dolazio je točno u devet i sve je bilo gotovo.
Clash — dolaziti (process) doesn't fit a single punctual arrival with a finished result.
✅ Došao je točno u devet i sve je bilo gotovo.
He arrived at exactly nine and everything was done. — single arrival: perfective doći.
Key Takeaways
- Suppletive pairs use unrelated stems for the two aspects. Memorise the top five as units: govoriti / reći, uzimati / uzeti, dolaziti / doći, stavljati / staviti, nalaziti / naći.
- The everyday "say" perfective is reći, not a prefixed govoriti — progovoriti means "start talking".
- Bi-aspectual verbs use one form for both aspects; the context (deadline vs duration vs background clause) decides the reading.
- Nearly all -irati loanwords are bi-aspectual — a built-in shortcut that spares you pairing for new and international vocabulary.
- A few native verbs (čuti, ručati, večerati, roditi, partly vidjeti) are bi-aspectual too; vidjeti gains a dedicated imperfective viđati only for habitual seeing.
Now practice Croatian
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Start learning Croatian→Related Topics
- Verbal Aspect: The Big PictureA2 — Why nearly every verb comes in an imperfective/perfective pair.
- Forming Aspect Pairs: PrefixationB1 — How perfectives are built by adding a prefix.
- govoriti / reći (to speak / say)A1 — The suppletive say/speak pair.
- uzimati / uzeti (to take)A2 — The taking pair — imperfective 'uzimati' (uzimam) and perfective 'uzeti' (uzmem, imperative uzmi!) — with the accusative object, the dative source, and the prefixed contrasts preuzeti and oduzeti.
- Choosing the Right Aspect: A Decision GuideB1 — A practical procedure for picking imperfective vs perfective.
- Compounding and Loanword IntegrationB2 — Native compounds with the linking -o-, purist coinages, and how borrowings are absorbed.