Ĵaŭde ni renkontiĝos ĉe la biblioteko kaj poste trinkos teon.

The basic noun is ĵaŭdo, meaning Thursday. In time expressions, Esperanto often uses an adverb form in -e, so ĵaŭde means on Thursday.

This is a very common pattern with days of the week:

• lundo → lunde
• mardo → marde
• ĵaŭdo → ĵaŭde

Another correct way to express this idea is ĵaŭdon, using the accusative for time, but ĵaŭde is very natural.

-os is the Esperanto future-tense ending.

So:

• renkontiĝos = will meet
• trinkos = will drink

Esperanto verb endings are very regular:

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

This is a very common learner question.

• renkonti often means to meet in the sense of encountering someone
• renkontiĝi means to meet up, to come together, or to meet each other

The element -iĝ- often makes a verb more intransitive or shows a change/state coming about. Here it helps give the sense of meeting one another rather than simply meeting someone as an object.

So with ni as the subject, ni renkontiĝos naturally means we will meet up or we will meet each other.

The main special letters here are:

• ĵ sounds like the s in measure
• ĝ sounds like the j in jam
• ĉ sounds like the ch in church
• ŭ is a short glide, and aŭ sounds roughly like ow in cow

So:

• ĵaŭde ≈ ZHOW-deh
• renkontiĝos ≈ ren-kon-TEE-jos
• ĉe ≈ cheh

Also, Esperanto stress is always on the second-to-last syllable:

• ĴAŬ-de
• ren-kon-TI-ĝos
• bib-lio-TE-ko
• POS-te
• TE-on

ĉe usually means at, by, or near a place or person.

So ĉe la biblioteko means at the library or by the library. It often suggests the library as the meeting point, without clearly saying whether you are inside it.

By contrast:

• en la biblioteko = in the library, inside the library

So if the idea is simply where to meet, ĉe is often the better choice.

la is the definite article, meaning the.

So la biblioteko means the library. This usually suggests a specific library that both speaker and listener can identify from the context.

Without la, the noun would be more indefinite or generic, which is usually less natural here. In a sentence about making plans, people normally mean a particular library.

Because the subject stays the same.

In Ĵaŭde ni renkontiĝos ĉe la biblioteko kaj poste trinkos teon, the subject ni applies to both verbs:

• ni renkontiĝos
• ni trinkos

Esperanto often leaves out the repeated subject in the second part of a coordinated sentence, just like English does:

• We will meet at the library and later drink tea

You could also say kaj poste ni trinkos teon, but repeating ni is not necessary.

The -n marks the direct object.

Here, teon is the thing being drunk, so it takes the accusative ending:

• trinki teon = to drink tea

This is one of the most important features of Esperanto grammar. The direct object usually gets -n.

Compare:

• teo = tea
• teon = tea as the direct object

Esperanto has no indefinite article. It has only the definite article la.

So a bare noun can often mean things like:

• tea
• some tea
• a tea

depending on context.

That is why trinkos teon is perfectly normal. You do not need a separate word for a or some.

It is not fixed. poste means afterward or later, and Esperanto word order is fairly flexible.

This sentence is natural as written:

• ...kaj poste trinkos teon

But you could also say:

• Ĵaŭde ni renkontiĝos ĉe la biblioteko kaj trinkos teon poste
• Ĵaŭde ni renkontiĝos ĉe la biblioteko, kaj poste ni trinkos teon

Some versions sound smoother than others, but they are grammatically possible. The original wording is a very normal and clear choice.

In Esperanto, days of the week are usually not capitalized in the middle of a sentence.

Here Ĵaŭde is capitalized simply because it is the first word of the sentence.

So you would write:

• Ĵaŭde ni renkontiĝos...

but in the middle of a sentence:

• Ni renkontiĝos ĵaŭde.

Yes. Both are possible.

• ĵaŭde = adverbial time expression, on Thursday
• ĵaŭdon = accusative of time, also on Thursday

So both of these are correct:

• Ĵaŭde ni renkontiĝos ĉe la biblioteko.
• Ĵaŭdon ni renkontiĝos ĉe la biblioteko.

For many learners, ĵaŭde feels easier at first, but both are standard Esperanto.