When you say something in Polish, you can also signal how sure you are and where the information came from — whether it's your own assertion, an inference, a guess, or something you merely heard. English does this mostly with modal verbs ("must," "should," "might") and a few adverbs ("probably," "apparently," "supposedly"). Polish leans more heavily on adverbs and particles, and — the part English speakers most often miss — it has a set of dedicated hearsay markers that explicitly flag information as reported rather than asserted. This page sorts the toolkit by what it does: marking probability, marking inference and expectation, and marking the source (evidentiality).
Probability: a ladder of certainty
Polish has a tidy ladder of adverbs and particles for degrees of likelihood. Learn them as a graded set:
| Marker | Rough certainty | Gloss |
|---|---|---|
| na pewno | ~100% | definitely, for sure |
| pewnie / zapewne | ~80% | surely, most likely (zapewne more formal) |
| chyba | ~60–70% | probably, I think, I suppose |
| może | ~40–50% | maybe, perhaps |
| chyba że | conditional | unless |
Na pewno jutro przyjdę, obiecuję.
I'll definitely come tomorrow, I promise.
Pewnie jest w pracy, zadzwoń na komórkę.
He's surely at work, call his mobile.
Chyba zostawiłem klucze w domu.
I think I left my keys at home. / I've probably left my keys at home.
Może pójdziemy na spacer, skoro jest tak ładnie?
Maybe we'll go for a walk, since it's so nice out?
The workhorse is chyba — a hedge meaning "I think / probably / I suppose," which softens an assertion to "I'm fairly but not fully sure." Note its placement is flexible and it carries a distinctly tentative, spoken flavour; it is one of the most frequent words in conversational Polish. Beware the false friend: pewnie looks like "for certain" but actually means "probably / I'd guess" — only the phrase na pewno means "definitely."
Inference and expectation: musieć and powinien
Just like English "must" and "should," two modal verbs do double duty — they cover obligation and the speaker's reasoning about what is likely or expected.
musieć for inference ("it must be the case that..."). When you conclude something from evidence, musieć gives the confident deduction:
To musi być pomyłka — nigdy nie zamawiałem tej książki.
That must be a mistake — I never ordered this book.
Skoro nie odbiera, musi być na spotkaniu.
Since he's not picking up, he must be in a meeting.
Musiało padać w nocy, bo chodnik jest mokry.
It must have rained in the night, because the pavement is wet.
This is the same logic as English "must": not obligation here, but the only conclusion the evidence allows. (For the full conjugation and the obligation use, see musieć and musieć vs trzeba.)
powinien for expectation ("ought to / should by now"). The defective adjective-like modal powinien expresses not just duty but what you reasonably expect to be true:
Powinien już być w domu, wyszedł godzinę temu.
He should be home by now, he left an hour ago.
Pociąg powinien przyjechać o czternastej.
The train should arrive at two p.m. (that's the expectation)
To nie powinno być trudne.
That shouldn't be difficult.
Remember powinien agrees in gender and number (powinien / powinna / powinno / powinni / powinny) and forms the past with a był-element: powinien był przyjść ("he should have come"). The "expectation" reading is identical to English "should": powinien już być = "he should be here by now," a confident prediction, not a command.
Hearsay: marking that you're only reporting
This is the area English speakers underuse, because English crams it into one or two overworked words ("apparently," "supposedly"). Polish has several dedicated hearsay adverbs, and they differ in tone — neutral, colloquial, or sceptical. They flag the proposition as something I heard, not something I'm asserting.
podobno — neutral "apparently / reportedly." The default, no judgement implied:
Podobno będzie padać przez cały weekend.
Apparently it's going to rain all weekend.
Podobno otwierają nową piekarnię na rogu.
Reportedly they're opening a new bakery on the corner.
ponoć — "they say / I hear," slightly more colloquial and folksy, otherwise close to podobno:
Ponoć w młodości był świetnym pływakiem.
They say he was a great swimmer in his youth.
rzekomo — "allegedly / supposedly," and crucially sceptical: it signals you doubt or distance yourself from the claim. Using rzekomo implies "so they claim, but I'm not convinced":
Rzekomo był chory, ale widziano go na meczu.
He was allegedly ill, but he was seen at the match.
To rzekomo oryginał, ale wygląda mi na podróbkę.
It's supposedly the original, but it looks like a fake to me.
jakoby — a reportative subordinator, "(claiming) that supposedly," typically introducing a clause; more formal/written and also carries doubt:
Twierdzą, jakoby nic nie wiedzieli o sprawie.
They claim they (supposedly) knew nothing about the matter.
And the plain periphrasis mówią, że ("they say that") / podobno mówią for everyday reported rumour:
Mówią, że zima w tym roku będzie ostra.
They say the winter will be harsh this year.
mieć + infinitive: the reportative "is said to"
A special and very Polish device: the verb mieć ("to have") + infinitive can express hearsay or a planned/expected outcome reported by others — "is supposed to / is said to." This is distinct from mieć's obligation use; context disambiguates.
Nowy film Holland ma być świetny.
Holland's new film is supposed to be great. (so people say)
Jutro ma padać śnieg.
It's supposed to snow tomorrow. (per the forecast)
Podobno mają się pobrać latem.
Apparently they're supposed to get married in the summer.
Ma być dobry = "it's said to be good / it's supposed to be good," reporting others' expectation rather than your own observation. With future/weather it overlaps with prediction-by-report ("is forecast to"). This mieć + infinitive is one of the cleanest places where Polish grammaticalises evidentiality in a verb.
Ten lek ma pomagać na migreny.
This medicine is supposed to help with migraines. (that's the claim)
Putting source and certainty together
Notice that probability and hearsay are independent dimensions and can stack. You can be confident that you heard something while reporting it neutrally, or hedge a rumour:
Podobno chyba odwołali koncert, ale nie jestem pewien.
Apparently they probably called off the concert, but I'm not sure.
Na pewno coś tam mówili, tylko nie pamiętam co.
They definitely said something about it, I just don't remember what.
The first stacks podobno (I heard it) with chyba (I'm only fairly sure of the content). English would labour over this ("apparently they've probably..."); Polish slots the two markers together cleanly.
Why English speakers find this hard
Two gaps. First, English conflates hearsay into "apparently / supposedly," which are ambiguous between neutral report and scepticism — so learners don't realise Polish makes them choose a tone (podobno vs rzekomo) and they over-use the sceptical rzekomo for neutral reports, accidentally sounding suspicious. Second, English speakers don't expect a possession verb (mieć) to mean "is said to," so they miss ma być dobry and reach for clunkier paraphrases. The flip side is reassuring: musieć (inference) and powinien (expectation) map almost exactly onto English "must" and "should," so that half of the system transfers cleanly.
Common Mistakes
❌ Pewnie pada, weź parasol — jestem pewien. (meaning 'it's definitely raining')
Pewnie = 'probably', not 'definitely'
✅ Na pewno pada, weź parasol.
It's definitely raining, take an umbrella.
Pewnie means "probably / I'd guess." For certainty you need na pewno.
❌ Rzekomo będzie ładna pogoda, więc cieszę się na wycieczkę. (neutral report)
Rzekomo signals doubt — odd when you're looking forward to it
✅ Podobno będzie ładna pogoda, więc cieszę się na wycieczkę.
Apparently the weather will be nice, so I'm looking forward to the trip.
Rzekomo carries scepticism; for a neutral "apparently/reportedly," use podobno.
❌ Ten film podobno jest dobry być. (trying to say 'is supposed to be good')
Garbled — 'is supposed to be' is mieć + infinitive: ma być
✅ Ten film ma być dobry.
This film is supposed to be good.
The reportative "is said/supposed to be" is mieć + infinitive: ma być dobry.
❌ Chyba na pewno przyjdę. (trying to commit firmly)
Chyba (probably) clashes with na pewno (definitely)
✅ Na pewno przyjdę.
I'll definitely come.
Chyba hedges; pairing it with na pewno contradicts your own certainty. Pick one level on the ladder.
❌ On powinien był przyjść wczoraj i przyszedł. (meaning expectation that held)
Powinien był + 'and he came' implies he should have but the past clause jars
✅ Powinien był przyjść wczoraj, ale się nie zjawił.
He should have come yesterday, but he didn't show up.
Powinien był + infinitive means "should have (but...)," typically with an unmet expectation; pair it with a contrastive clause.
Key Takeaways
- Probability rides on a ladder of adverbs: na pewno (definitely) > pewnie/zapewne (surely) > chyba (probably) > może (maybe).
- Beware: pewnie = "probably," only na pewno = "definitely."
- musieć marks confident inference ("must be"); powinien marks expectation ("should by now") — both map onto English.
- Polish has dedicated hearsay adverbs: podobno (neutral), ponoć (folksy), rzekomo / jakoby (sceptical, "allegedly").
- mieć + infinitive = "is supposed to / is said to" — a reportative use of "have" (ma być dobry).
- Certainty and source are independent and can stack (podobno chyba... = "apparently probably...").
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- musieć — must, have toA2 — Full reference for musieć ('must, have to'): present muszę/musisz…/muszą, past musiał/musiała/musieli/musiały, conditional musiałbym — and the crucial trap that nie musieć means 'not have to', never 'must not'.
- Obligation: musieć, trzeba, miećA2 — How Polish expresses necessity and obligation — personal musieć, impersonal trzeba, the softer mieć + infinitive, and powinien — plus the negation trap where nie musieć means 'don't have to', not 'mustn't'.
- Attitudinal Particles: przecież, chyba, może, akuratB2 — The little stance-words — but-surely, probably, maybe, yeah-right — that carry attitudes English packs into intonation or whole phrases.
- Hedging and Softening: chyba, w sumie, raczej, jakbyB2 — The Polish hedges — chyba, właściwie, w sumie, raczej, jakby, powiedzmy — that soften claims, signal tentativeness, and keep you from sounding blunt.
- Reported (Indirect) SpeechB1 — How Polish reports what people said — with że for statements, czy/wh for questions, żeby for commands — and crucially with NO tense backshift: the original tense is kept exactly as spoken.