La karto validas ĝis junio.

La is the definite article, meaning the. Esperanto has just one definite article: la. It does not change for gender, number, or case in this sentence.

So:

• la karto = the card

Karto is a noun, and Esperanto nouns normally end in -o.

• karto = card

It is not karta, because -a is an adjective ending. It is not karton, because -n is the accusative ending, usually used for a direct object or for motion toward something. Here karto is the subject of the sentence, so no -n is needed.

Validas is the present-tense form of the verb validi, meaning to be valid.

Esperanto verb endings are very regular:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command / jussive
• -i = infinitive

So:

• validas = is valid / are valid

In this sentence, La karto validas means The card is valid.

Yes. In Esperanto, many ideas that use to be + adjective in English can sometimes be expressed with a single verb.

So instead of something like is valid, Esperanto commonly uses:

• validi = to be valid

That means:

• La karto validas = The card is valid

This is normal and natural Esperanto.

Ĝis means until, up to, or as far as in time or space.

In this sentence it marks the endpoint of validity:

• ĝis junio = until June

So the whole sentence says that the card remains valid up to that time.

After ĝis, you normally do not add the accusative -n just because it refers to time.

So the natural form is:

• ĝis junio

not:

• ĝis junion

This is because ĝis already functions as a preposition introducing the endpoint.

Because ĝis itself already does the job. It directly introduces the limit in time.

So Esperanto says:

• ĝis junio = until June

You do not need another preposition such as al here.

Normally, no. In Esperanto, month names are usually written in lowercase unless they begin a sentence.

So standard Esperanto is:

• junio

not necessarily:

• Junio

This is different from English, where June is always capitalized.

Junio is a noun, just like the names of the other months in Esperanto.

It ends in -o, the normal noun ending.

Examples:

• januaro = January
• februaro = February
• junio = June

It can, depending on context, but learners should be careful.

Ĝis junio most directly means until June, with June as the endpoint. In real usage, people may sometimes interpret that loosely, but if you want to be completely clear that something remains valid for the whole month of June, you would often say something more explicit, such as:

• ĝis la fino de junio = until the end of June

So ĝis junio is natural, but it may not always guarantee the meaning through all of June.

Yes, Esperanto word order is fairly flexible, because the endings help show grammatical roles.

The normal, straightforward order here is:

• La karto validas ĝis junio.

That is the clearest and most neutral version.

You might see variations for emphasis, but beginners should stick with the standard order: subject + verb + time expression.

Ĝis is pronounced roughly like jees but with the first sound like the j in judge or jam.

More approximately:

• ĝ = like English j in job
• i = like ee
• s = like s in see

So ĝis sounds approximately like jees.

A rough English-style pronunciation is:

• lah KAR-toh vah-LEE-dahs jees YOO-nee-oh

A few details:

• La = lah
• karto = KAR-toh
• validas = vah-LEE-dahs
• ĝis = jees
• junio = yoo-NEE-oh

Stress in Esperanto normally falls on the second-to-last syllable:

• KAR-to
• va-LI-das
• ju-NI-o

Usually yes, but the exact kind of card depends on context.

Karto can mean things like:

• a card
• a ticket/card pass
• an ID card
• a bank card
• a game card

So in this sentence, the meaning of karto depends on the situation. The grammar, however, stays the same.

Yes. That is also grammatical:

• La karto estas valida ĝis junio.

This uses:

• estas = is
• valida = valid

So it literally means The card is valid until June.

Both versions are correct:

• La karto validas ĝis junio.
• La karto estas valida ĝis junio.

The version with validas is a little more compact.