Počet lidí je vysoký.

Literally, počet means number or count, and lidí means of people. So počet lidí means the number of people.

In this sentence, počet is the grammatical subject.

Because počet is a quantity noun, and in Czech, quantity nouns are commonly followed by the genitive.

So you get:

• počet lidí = number of people
• počet studentů = number of students
• počet aut = number of cars

This is a very common pattern.

Because the sentence needs the genitive plural form.

Here is the difference:

• lidé = nominative plural, standard people
• lidi = colloquial nominative/accusative plural
• lidí = genitive plural, of people

After počet, Czech requires the genitive, so lidí is the correct form.

Yes. The singular noun is člověk = person, but its plural is irregular: lidé = people.

That means the forms come from this plural set:

• lidé = people
• lidí = of people

So even though the basic singular is člověk, the plural forms use lid-.

Because the subject is not people. The subject is počet = number, which is singular.

So Czech treats it like English:

• The number of people is high not
• The number of people are high

That is why the verb is je = is.

Because it agrees with počet, not with lidí.

Počet is:

• singular
• masculine
• nominative

So the predicate adjective must match it:

• Počet je vysoký

If the subject were feminine, the adjective would change:

• Cena je vysoká = The price is high

If it were neuter:

• Číslo je vysoké = The number is high

Yes. Vysoký can mean both tall and high, depending on context.

With people, it often means tall:

• vysoký muž = a tall man

With quantities or levels, it means high:

• vysoká cena = high price
• vysoká teplota = high temperature
• vysoký počet = high number

So in this sentence, vysoký means high.

Yes, it is grammatical and natural, especially in more formal, written, statistical, or official contexts.

It sounds like something you might read in a report, article, or analysis.

In everyday conversation, Czech speakers would often say something simpler, such as:

• Je tam hodně lidí = There are a lot of people there
• Přišlo hodně lidí = A lot of people came
• Bylo tam moc lidí = There were too many/a lot of people there

Yes. Velký počet lidí means a large number of people, and it is perfectly normal.

Both velký počet lidí and vysoký počet lidí are used. Very roughly:

• velký often feels a bit more general
• vysoký often fits well with measured levels, statistics, and formal style

So:

• Velký počet lidí přišel = A large number of people came
• Počet lidí je vysoký = The number of people is high

Both are fine.

No. Czech does not have articles like a or the.

So Počet lidí je vysoký naturally corresponds to The number of people is high in English.

Czech usually expresses definiteness through context rather than articles.

The neutral word order is:

Počet lidí je vysoký.

That is the most straightforward way to say it.

Czech word order is flexible, but changing it usually changes the emphasis. For example:

• Vysoký je počet lidí sounds marked or literary
• Je vysoký počet lidí is possible in some contexts, but it is not the most neutral version here

So for a learner, Počet lidí je vysoký is the best default form.

A rough pronunciation is:

PO-chet LI-dee ye VY-so-kee

A few helpful points:

• č sounds like ch in check
• j sounds like y in yes
• í is a long ee
• stress is usually on the first syllable of each word

So the stress pattern is:

POčet LIdí je VYsoký