Stav je dobrý.

Stav is a noun. It is masculine inanimate in Czech.

In this sentence, stav is in the nominative singular because it is the subject of the sentence.

Je is the 3rd person singular form of the verb být (to be).

So stav je dobrý literally has the structure:

• stav = subject
• je = is
• dobrý = adjective describing the subject

Czech often works like English here: X is Y.

The adjective has to agree with the noun it describes.

Since stav is:

• masculine
• singular
• nominative

the adjective must also be in the masculine singular nominative form:

• masculine: dobrý
• feminine: dobrá
• neuter: dobré

So stav je dobrý is correct because stav is masculine singular.

It is an adjective.

It describes the noun stav. In Czech, after být (to be), adjectives often stay in the nominative when they describe what something is like.

So here, dobrý means good as a quality of the noun stav.

A simple learner-friendly pronunciation is:

stav ye do-bree

A bit more closely:

• stav = like stahf with a short a
• je = ye
• dobrý = dob-ree, with stress on the first syllable: DO-bree

A few helpful notes:

• Czech j is pronounced like English y in yes
• ý is a long vowel, so the final -ý is longer than a short y
• Czech stress is usually on the first syllable of the word

In modern standard Czech, ý and y are pronounced the same quality-wise, but ý is longer.

So:

• y = short vowel
• ý = long vowel

In dobrý, the last vowel is long, which is why it is written ý.

For learners, the most important thing is to remember that the accent mark shows vowel length, not stress.

Yes, Czech word order is more flexible than English, but Stav je dobrý is the most neutral, straightforward order.

Other orders are possible in context, for example:

• Dobrý je stav.
• Je stav dobrý? (more naturally as a question in speech, though intonation matters)

However, the basic neutral statement is:

Stav je dobrý.

Czech word order often changes for emphasis, topic/focus, or style.

Normally, in the present tense, Czech usually keeps forms of být in sentences like this.

So:

• correct: Stav je dobrý.
• not standard here: Stav dobrý.

You may sometimes see omission in headlines, notes, or very informal speech, but for normal full sentences, use je.

No. Stav is a fairly broad noun and can refer to different kinds of state, condition, or status, depending on context.

For example, it can describe:

• physical condition
• technical condition
• general state of something
• a situation or status

So the exact nuance depends on what is being talked about.

That is a very good question, because Czech sometimes uses the instrumental after forms of být, especially with nouns.

But with adjectives like this, Czech commonly uses the nominative to describe a quality:

• Stav je dobrý.

This is the normal pattern here.

Very roughly:

• adjective describing a subject after být → often nominative
• noun after být can sometimes appear in nominative or instrumental, depending on structure and style

For this sentence, dobrý in nominative is exactly what you expect.

That depends on the noun.

If you made stav plural, it would be stavy, and the adjective would also change to plural:

• Stavy jsou dobré.

Changes:

• stav → stavy
• je → jsou
• dobrý → dobré

This shows how both the verb and adjective agree with the subject.

It is neutral.

Nothing in Stav je dobrý. is especially formal or informal. It is a standard, natural Czech sentence.

Whether it sounds formal or informal depends more on the situation and what stav refers to than on the grammar itself.