Moderátor vyhlásí výsledky po kvízovém kole.

Because vyhlásí is a perfective verb form.

In Czech, perfective verbs often use what looks like the present tense to express a future completed action. So:

• vyhlásí = will announce / will declare
• dictionary form: vyhlásit = a perfective verb

Compare:

• vyhlašuje = is announcing / announces regularly (imperfective)
• vyhlásí = will announce once, as a completed event (perfective)

So in this sentence, Moderátor vyhlásí výsledky... naturally means The host/presenter will announce the results...

Moderátor is in the nominative singular because it is the subject of the sentence — the person doing the action.

The basic dictionary form is also moderátor.

So:

• moderátor = subject, who will announce the results

Czech marks grammatical roles with case endings, but here the nominative form happens to look just like the dictionary form.

Výsledky is in the accusative plural because it is the direct object of the verb vyhlásí — it is the thing being announced.

Basic form:

• singular: výsledek = result
• plural: výsledky = results

Here, výsledky means the results as the object of the sentence.

A useful detail: výsledek is a masculine inanimate noun, and in the plural, the nominative and accusative forms are often the same. So výsledky can be either nominative plural or accusative plural depending on its role in the sentence. Here it is accusative because it is the object.

Because the preposition po normally takes the locative case when it means after in a time sense.

So:

• po = after
• kvízovém kole = locative singular

The basic form is:

• kvízové kolo = quiz round

After po, both words change into the locative singular:

• kvízové → kvízovém
• kolo → kole

So po kvízovém kole literally means after the quiz round.

The dictionary form is kvízové kolo.

Breakdown:

• kvízový / kvízové = quiz-, relating to a quiz
• kolo = round

In this sentence, that phrase has been changed to the locative singular after po, so:

• kvízové kolo → po kvízovém kole

This is a very common pattern in Czech: the preposition determines the case, and the adjective and noun both change to match it.

Because Czech often prefers an adjective + noun structure where English often uses a noun + noun structure.

So English says:

• quiz round

But Czech naturally says:

• kvízové kolo

Here, kvízový is an adjective made from kvíz. This is extremely common in Czech. English learners often need to get used to turning English noun modifiers into Czech adjectives.

Other similar patterns are:

• sportovní klub = sports club
• filmový festival = film festival
• jazyková škola = language school

Yes. Czech word order is flexible, because case endings show the grammatical roles.

The original sentence:

• Moderátor vyhlásí výsledky po kvízovém kole.

Other possible orders include:

• Po kvízovém kole moderátor vyhlásí výsledky.
• Výsledky moderátor vyhlásí po kvízovém kole.

These all mean roughly the same thing, but the emphasis changes:

• starting with po kvízovém kole emphasizes the time
• starting with výsledky emphasizes the results
• the original order is neutral and straightforward

So word order in Czech is not random, but it is less rigid than in English.

Because vyhlásit has the sense of officially declaring or announcing something publicly.

That makes it a very natural choice for results, winners, decisions, and formal announcements.

Rough comparison:

• říct = to say, to tell
• oznámit = to announce, to inform
• vyhlásit = to declare, proclaim, announce officially

For results of a competition or quiz, vyhlásit výsledky is a very common and natural collocation.

In Czech, the accents here mainly show vowel length.

Examples:

• á, í, ý, é = long vowels

So:

• moderátor has a long á
• vyhlásí has long á and long í
• kvízovém has long í and long é

A very important point for English speakers: Czech word stress is usually on the first syllable of the word, not on the accented vowel.

So although á or í is long, the stress still usually stays at the beginning:

• MO-derátor
• VY-hlásí
• KVÍ-zovém
• KO-le

The accent does not mean stress in the way it often does in some other languages; it mainly marks vowel length.

Czech has no articles like English a/an and the.

So:

• Moderátor can mean a moderator / the moderator
• výsledky can mean results / the results
• po kvízovém kole can mean after a quiz round / after the quiz round

Which one is meant depends on context.

In this sentence, English would probably use the:

• The moderator will announce the results after the quiz round.

But Czech does not need separate words for that.

Yes, very often.

Because the verb form vyhlásí already tells you that the subject is he/she/it (or sometimes a polite you depending on context), Czech can often omit the subject if it is clear.

So in context, you might hear:

• Po kvízovém kole vyhlásí výsledky.

That could mean:

• After the quiz round, he/she will announce the results.

However, keeping moderátor in the sentence makes it explicit and clearer, especially if you are introducing new information or avoiding ambiguity.