Konsument powiadomi przedsiębiorcę pod warunkiem, że termin nie upłynął.

Because powiadomić is a perfective verb. In Polish, perfective verbs do not normally have a true present tense for ongoing actions. Forms that look present, like powiadomi, usually refer to the future:

• powiadamia = is notifying / notifies regularly or habitually
• powiadomi = will notify, notify once and complete the action

So konsument powiadomi przedsiębiorcę means that the consumer will notify the business/trader.

Because przedsiębiorcę is the accusative singular form, and here it is the direct object of powiadomi.

The basic form is:

• przedsiębiorca = trader / entrepreneur / businessperson

But after a transitive verb like powiadomić when the noun is the object, Polish changes the form:

• powiadomi kogo? → przedsiębiorcę

So the sentence uses:

• konsument = subject
• przedsiębiorcę = object

Yes. Przedsiębiorca is a masculine personal noun, even though it ends in -a, which often looks feminine to English learners.

Polish has a group of masculine nouns like this, for example:

• mężczyzna = man
• kolega = male friend/colleague
• sprzedawca = salesman/seller
• przedsiębiorca = entrepreneur/trader

Their endings behave differently from typical feminine nouns. That is why the accusative becomes przedsiębiorcę.

It is a fixed expression meaning provided that, on condition that, or under the condition that.

Literally:

• pod warunkiem = under the condition
• że = that

Together, the phrase introduces a condition in a fairly formal way. It is especially common in legal, administrative, or formal written language.

Because że introduces a subordinate clause, and in Polish that clause is normally separated by a comma.

So in:

• pod warunkiem, że termin nie upłynął

the part after że is the dependent clause, so the comma is required.

This is very normal in Polish punctuation. English often uses fewer commas in similar places, so this can feel unusual at first.

This is a very common point of confusion.

Upłynął is the past form of the perfective verb upłynąć. In Polish, the past tense is often used where English would use something like the present perfect:

• termin nie upłynął = the deadline has not expired / has not passed

So the idea is not simply past time in the English sense. It describes whether the deadline has already expired by the relevant moment.

Polish does not have a separate present perfect tense like English, so the past form often does this job.

Termin is in the nominative singular, because it is the subject of upłynął.

In the clause:

• termin nie upłynął

the deadline is the thing that has or has not passed. So termin is not an object here; it is the grammatical subject.

Because with finite verbs, nie is usually written as a separate word in Polish.

So:

• upłynął = expired / passed
• nie upłynął = did not expire / has not expired

This is standard for verbs. English speakers sometimes expect it to attach more often, but with normal verb forms it stays separate.

Grammatically, in many contexts you could use jeśli to express a condition, but the nuance is different.

• jeśli = if
• pod warunkiem, że = provided that / on condition that

Pod warunkiem, że sounds more formal and more restrictive. It suggests a condition that must be satisfied. In legal or official language, it is often preferred because it sounds precise.

So jeśli might be possible in more everyday language, but it would not sound as formal or legal.

Yes, Polish word order is fairly flexible, because case endings show grammatical roles.

For example, you could also say:

• Pod warunkiem, że termin nie upłynął, konsument powiadomi przedsiębiorcę.

This puts the condition first.

However, the original version sounds natural and clear, especially in formal writing. In legal-style sentences, writers often choose the order that feels most orderly and unambiguous.

Yes, very much so.

Several things make it sound formal:

• konsument and przedsiębiorca are common in legal and administrative language
• powiadomi is more formal than very casual alternatives
• pod warunkiem, że is a formal conditional expression
• termin nie upłynął also sounds official and precise

So this is the kind of sentence you might expect in regulations, contracts, consumer-rights texts, or official instructions.

Because Polish has no articles like a or the.

Whether something is understood as a consumer or the consumer, a deadline or the deadline, depends on context rather than a separate article.

So Polish simply says:

• konsument
• przedsiębiorcę
• termin

and the exact definiteness is inferred from the situation or from the broader text.