Spoluúčast je vysoká.

Because spoluúčast is a feminine singular noun, and Czech adjectives agree with the noun they describe.

The adjective’s basic dictionary form is vysoký, but in this sentence it changes to match spoluúčast:

• vysoký — masculine singular
• vysoká — feminine singular
• vysoké — neuter singular

So Spoluúčast je vysoká is grammatically matched.

You usually have to learn the gender of each noun, but there are patterns. Spoluúčast is feminine because it belongs to the same pattern as nouns like účast, radost, možnost, etc., which are feminine abstract nouns.

Even though it ends in a consonant, it is still feminine. In Czech, noun gender is not determined only by the final letter.

It is in the nominative singular because it is the subject of the sentence.

The adjective vysoká is also nominative singular, because after je it functions as a predicate adjective and agrees with the subject.

So the structure is:

• spoluúčast — subject, nominative singular
• je — is
• vysoká — predicate adjective, nominative singular feminine

Je is the 3rd person singular present tense of být (to be).

So the sentence has the basic pattern:

X je Y = X is Y

In normal standard Czech, you usually keep je in a sentence like this. Leaving it out would sound incomplete in ordinary speech, though omission can happen in headlines, labels, or very compressed style.

Because Czech does not have articles.

English needs words like the and a/an, but Czech normally does not. The exact meaning—whether it is definite, indefinite, or general—is understood from context.

So spoluúčast can correspond to things like the deductible/copay, a deductible/copay, or the concept in general, depending on the situation.

Not as strictly as in English.

Spoluúčast je vysoká is the neutral, standard word order. Czech allows more flexibility because the grammar is shown by endings, not just by position.

You may also see changed word order for emphasis, but the neutral learner-friendly version is:

Spoluúčast je vysoká.

No. Czech does not require a subject pronoun when the subject is already clearly stated.

Since spoluúčast is explicitly present, adding ona would usually be unnecessary.

So:

• Spoluúčast je vysoká. — normal
• Ona je vysoká. — would mean It/she is high, but only if the reference is already clear

A simple English-friendly approximation is:

SPO-loo-oo-chast ye VY-so-kaa

A few useful points:

• Czech stress is usually on the first syllable of each word:
  • SPOluúčast
  • je
  • VYsoká
• č sounds like ch in church
• j sounds like English y in yes
• á is a long vowel, so the last syllable of vysoká is held a little longer

The dictionary form is vysoký.

Czech adjectives are normally listed in dictionaries in the masculine singular nominative form. That means when you look up vysoká, you should search for vysoký.

Yes. Czech uses vysoký / vysoká / vysoké not only for physical height, but also for things like:

• prices
• rates
• numbers
• levels
• financial amounts

So using vysoká here is completely natural and idiomatic.

It might be understandable, but vysoká is usually the more natural choice for amounts, rates, charges, or financial burden.

Velká means big/large, while vysoká is often preferred when English would say high.

So for a learner, Spoluúčast je vysoká is the safer and more idiomatic form.

The standard yes/no question is:

Je spoluúčast vysoká?

Czech commonly forms yes/no questions by putting the verb first. So:

• statement: Spoluúčast je vysoká.
• question: Je spoluúčast vysoká?

In speech, intonation also helps show that it is a question.