Żeton jest na polu.

Because na can take different cases depending on the meaning:

• na + locative = location, meaning on / at
• na + accusative = movement toward a place, meaning onto / to

Here, the token is already there, so this is a location meaning:

• na polu = on the square/field

Compare:

• Żeton jest na polu. = The token is on the square/field.
• Kładę żeton na pole. = I am placing the token onto the square/field.

So polu is the locative singular form of pole.

• Żeton is in the nominative singular because it is the subject of the sentence.
• polu is in the locative singular because it follows na in a static location meaning.

So the structure is:

• Żeton = subject
• jest = is
• na polu = prepositional phrase meaning on the square/field

The basic dictionary form is pole.

Here is the change:

• pole = nominative singular
• polu = locative singular

This is a common neuter-noun pattern. For example:

• miejsce → na miejscu
• pole → na polu

So polu is not a separate word; it is just the case form of pole.

Żeton usually means token, chip, or counter, depending on the context.

Possible uses include:

• a board game token
• a casino chip
• a token used in a machine or game

So in a sentence like Żeton jest na polu, many learners would naturally imagine a board-game token on a square/space.

Also, żeton is a masculine inanimate noun.

No. Pole can mean different things depending on context. Common meanings include:

• field
• area
• space
• square or space on a board/game board

In this sentence, if the context is a game, na polu often means:

• on the square
• on the space

So although pole is often taught first as field, that is not its only meaning.

Jest is the 3rd person singular form of być (to be), so it means is.

• Żeton jest na polu. = The token is on the square/field.

Unlike in some other Slavic languages, the present tense of to be is normally not omitted in standard Polish sentences like this. So jest is completely normal and expected here.

Yes. Polish word order is more flexible than English word order.

The sentence:

• Żeton jest na polu.

is a neutral way to say it.

Other possible orders include:

• Na polu jest żeton. = There is a token on the square/field.
  This puts more focus on the location.
• Żeton na polu jest. = possible, but marked or poetic/emphatic
• Jest żeton na polu. = possible in some contexts, but less neutral

For basic learning, Żeton jest na polu is the safest and most neutral version.

A rough pronunciation is:

ZHET-on yest na PO-loo

A more careful approximation:

• Żeton ≈ zheh-ton
• jest ≈ yest
• na ≈ nah
• polu ≈ PO-loo

A few sound notes:

• ż sounds like the s in measure
• j sounds like English y in yes
• e is like e in bed
• u is like oo in food

Stress in Polish usually falls on the second-to-last syllable, so:

• ŻE-ton
• PO-lu

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

So:

• Żeton jest na polu.

could mean, depending on context:

• The token is on the square.
• A token is on the square.

Polish usually leaves that distinction to context.

Not always. Na often means on, but depending on the noun and the context, it can also be understood as:

• on
• at
• sometimes to / onto when used with motion

Examples:

• na stole = on the table
• na uniwersytecie = at the university
• na pole = onto the field/square

So in na polu, on is a good translation, but the exact English wording can depend on the situation.

Normally, in standard Polish, you should keep jest here:

• Żeton jest na polu.

Leaving it out:

• Żeton na polu.

would not usually sound like a complete normal sentence in this context. It might work as a label, note, game-state shorthand, or very informal elliptical speech, but not as the standard full sentence.

So for learners, the correct full version is:

• Żeton jest na polu.