Ogień jest gorący.

A rough English-friendly pronunciation is:

• Ogień ≈ OH-gyeń
• jest ≈ yest
• gorący ≈ go-RON-tsy

A few important sounds:

• ń is a soft n sound, a bit like Spanish ñ, but not exactly the same.
• j in Polish sounds like English y in yes.
• ą is a nasal vowel. In gorący, it often sounds roughly like on before the next consonant.

Polish stress usually falls on the second-to-last syllable:

• O-gień
• go-RĄ-cy

The sentence breaks down like this:

• ogień — a noun, meaning fire
• jest — the verb is
• gorący — an adjective, meaning hot

So the structure is:

• subject: ogień
• verb: jest
• description: gorący

In Polish, every noun has a grammatical gender. Ogień is a masculine noun.

This matters because adjectives must match the noun they describe. Since ogień is masculine singular, the adjective also has to be masculine singular:

• ogień jest gorący

If the noun were feminine, the adjective would change:

• woda jest gorąca — water is hot

If it were neuter:

• mleko jest gorące — milk is hot

Because Polish adjectives must agree with the noun in:

• gender
• number
• case

Here, ogień is:

• masculine
• singular
• nominative

So the adjective must also be:

• masculine
• singular
• nominative

That gives gorący.

Compare:

• gorący ogień — masculine
• gorąca woda — feminine
• gorące mleko — neuter
• gorące rzeczy — plural non-masculine-personal

Ogień is in the nominative case because it is the subject of the sentence.

Gorący is also in the nominative, because with an adjective after być (to be), Polish normally uses the nominative:

• Ogień jest gorący

This is worth noticing because noun complements often behave differently:

• Jan jest nauczycielem — Jan is a teacher

Here nauczycielem is instrumental, not nominative.

So:

• adjective after jest → usually nominative
• noun after jest → often instrumental

Jest is the 3rd person singular present tense of być, which means to be.

So:

• ja jestem — I am
• ty jesteś — you are
• on/ona/ono jest — he/she/it is

In Ogień jest gorący, ogień is singular, so jest is the correct form.

In normal standard Polish, no — you should keep jest here.

So:

• Ogień jest gorący — correct

Leaving it out would sound incomplete or unnatural in ordinary speech:

• Ogień gorący — not a normal full sentence in standard everyday Polish

Polish does sometimes omit forms of to be in very specific styles, such as headlines, poetry, notes, or casual fragments, but as a learner you should use jest here.

Because gorący is an adjective, while gorąco is usually an adverb or a weather/condition word.

Here you are describing a noun, ogień, so you need an adjective:

• Ogień jest gorący — Fire is hot

But gorąco is used in sentences like:

• Jest gorąco — It is hot
• Tu jest gorąco — It is hot here

So:

• describing a thing → gorący / gorąca / gorące
• describing the general temperature/condition → gorąco

Polish does not have articles like English the and a/an.

So ogień can mean:

• fire
• the fire

Which meaning is intended depends on context.

In a general statement like Ogień jest gorący, it is understood as something like:

• Fire is hot

In a specific situation, it could also mean:

• The fire is hot

Context tells you which one is meant.

Yes, Polish word order is more flexible than English, because endings carry a lot of the grammatical information.

The most neutral order here is:

• Ogień jest gorący

But other orders are possible for emphasis or style, for example:

• Gorący jest ogień — marked, poetic, or contrastive
• Jest gorący ogień — possible in some contexts, but not the neutral everyday choice

As a learner, the safest and most natural version is:

• Ogień jest gorący

You add nie before the verb:

• Ogień nie jest gorący — Fire is not hot

This is the standard way to negate jest.

So:

• jest — is
• nie jest — is not