Náklady jsou vysoké.

Because náklady is the plural form of náklad, which means cost, expense, or outlay depending on context.

So:

• náklad = a cost / one expense
• náklady = costs / expenses

In Czech, it is very common to talk about costs in the plural where English might sometimes use singular cost.

Because náklady is plural, the verb to be must also be plural.

Present tense of být (to be) includes:

• je = is (singular)
• jsou = are (plural)

So:

• Náklad je vysoký. = The cost is high.
• Náklady jsou vysoké. = The costs are high.

Because the adjective has to agree with the noun in number, gender, and case.

Here, náklady is plural, so the adjective must also be in the plural form:

• vysoký = singular masculine
• vysoké = plural form here

In this sentence, vysoké agrees with náklady.

It is in the nominative plural.

That is because náklady is the subject of the sentence:

• Náklady = the thing being described
• jsou vysoké = are high

So the basic pattern is:

• subject in nominative
  • form of být
    • description

Yes. Czech, like English, commonly uses high for prices, costs, numbers, and similar things.

So vysoké náklady is a very normal expression meaning:

• high costs
• high expenses

You could also learn related opposites:

• vysoké náklady = high costs
• nízké náklady = low costs

Czech does not have articles like English a or the.

So Náklady jsou vysoké can mean:

• Costs are high
• The costs are high

Which one is intended depends on context.

This is very normal in Czech, and learners have to get used to understanding definiteness from the situation rather than from an article.

Yes, Czech word order is more flexible than English word order.

The neutral order is:

• Náklady jsou vysoké.

But other orders are possible for emphasis, for example:

• Vysoké jsou náklady.
• Jsou náklady vysoké? = Are the costs high?

Even though word order can move, the basic meaning is still clear because the endings help show how the words relate to each other.

A simple learner-friendly pronunciation guide is:

• Náklady ≈ NAA-klah-dih
• jsou ≈ ysoh or zsoh (the j here is not like English j)
• vysoké ≈ VIH-so-kay

A few useful pronunciation notes:

• á is a long vowel
• é is also a long vowel
• Czech stress usually falls on the first syllable of each word:
  • NÁ-klady
  • jsou
  • vy-so-KÉ? Actually the stress is still on the first syllable: VY-so-ké

So the sentence is stressed roughly like:

• NÁklady jsou VYsoké

It can have a few related meanings depending on context.

Most commonly, náklady means:

• costs
• expenses

But in some contexts, Czech náklad / náklady can also relate to:

• printed copies of a publication (print run)
• cargo / load, in some uses of the singular náklad

So context matters. In this sentence, Náklady jsou vysoké, the natural meaning is clearly Costs are high or Expenses are high.

The singular version would be:

• Náklad je vysoký.

That means The cost is high.

Notice the changes:

• náklady → náklad
• jsou → je
• vysoké → vysoký

This is a good example of agreement in Czech: noun, verb, and adjective all change to match the singular subject.

Yes, often you can.

Depending on context, náklady may be translated as:

• costs
• expenses

Costs are high is usually the most direct translation, but Expenses are high may also fit well in many situations, especially in business or budgeting contexts.