Vino je u čaši.

• vino = wine
• je = is
• u = in
• čaši = glass in the form used after u to show location

So the structure is very close to English: Wine is in the glass.

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

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

Since vino is a singular noun, Croatian uses je: Vino je...

The basic dictionary form is čaša (glass). But after the preposition u when it means in, Croatian normally uses the locative case.

So:

• nominative: čaša
• locative: u čaši

This is why the ending changes from -a to -i.

Not always. U can be used with different cases depending on meaning.

Most importantly:

• u + locative = in / at a place, showing location
• u + accusative = into a place, showing movement toward it

Here there is no movement, only location:

• Vino je u čaši. = The wine is in the glass.

Compare:

• Stavljam vino u čašu. = I am putting the wine into the glass.

So:

• u čaši = in the glass
• u čašu = into the glass

In Croatian, many nouns ending in -o or -e are neuter. Vino is one of them.

That matters because adjective forms and some other words must agree with it. For example:

• dobro vino = good wine
• hladno vino = cold wine

The ending -o in the adjectives shows neuter singular agreement.

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

So vino can mean:

• wine
• the wine
• some wine

And u čaši can mean:

• in a glass
• in the glass

The exact meaning usually comes from context.

A rough pronunciation guide:

• č sounds like ch in chocolate, but usually a bit firmer
• š sounds like sh in shoe

So čaši is approximately CHAH-shee.

Also:

• vino = VEE-no
• je is usually pronounced like ye

So the whole sentence sounds roughly like: VEE-no ye oo CHAH-shee

Yes. Croatian word order is more flexible than English because the case endings already show grammatical relationships.

The most neutral order is:

• Vino je u čaši.

But you may also hear:

• U čaši je vino. = In the glass is wine / The wine is in the glass.

This kind of change usually affects focus or emphasis, not the basic meaning.

Here vino is being used as a mass noun, like wine in English.

So it refers to the substance, not to one individual item. Croatian often uses mass nouns this way without any article or extra marker:

• Voda je na stolu. = The water is on the table.
• Mlijeko je u hladnjaku. = The milk is in the fridge.

If you wanted to count servings or containers, you would usually use another noun:

• čaša vina = a glass of wine
• boca vina = a bottle of wine

Yes, it is completely natural. It is a simple and correct sentence.

Depending on context, a speaker might also say:

• Vino je u toj čaši. = The wine is in that glass.
• U čaši je vino. = The wine is in the glass. / There is wine in the glass.

But Vino je u čaši is perfectly normal Croatian.

Vino is in the nominative case here because it is the grammatical subject of the sentence.

In this sentence:

• vino = subject, nominative
• je = verb
• u čaši = prepositional phrase showing location, with čaši in the locative

So the sentence structure is: [subject] + [verb] + [location]