Questions & Answers about 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