La posedanto vizitos la apartamenton morgaŭ.

In Esperanto, the ending -os marks the future tense. So:

• vizitas = visits / is visiting
• vizitis = visited
• vizitos = will visit

The verb stem here is vizit-, so vizitos literally means will visit.

The -n ending marks the direct object in Esperanto. The direct object is the thing that receives the action of the verb.

In this sentence:

• La posedanto = the owner
• vizitos = will visit
• la apartamenton = the apartment

So the apartment is what is being visited, which is why it takes -n.

Because posedanto is the subject, not the direct object. The subject is the person or thing doing the action.

Here, the owner is doing the visiting, so:

• La posedanto = subject
• la apartamenton = direct object

Only the direct object gets -n here.

La means the. Esperanto has only one definite article, and it does not change for gender, number, or case.

It appears twice because both nouns are definite:

• la posedanto = the owner
• la apartamenton = the apartment

Just like in English, you often repeat the before each noun phrase.

Posedanto comes from the verb posedi, meaning to own or to possess.

The ending -ant- means someone doing the action, and -o marks a noun. So:

• posedi = to own
• posedant- = owning person
• posedanto = owner

So posedanto literally means something like owning person.

Yes. Esperanto word order is fairly flexible, especially because the -n ending helps show what is the object.

So all of these are grammatical:

• La posedanto vizitos la apartamenton morgaŭ
• La posedanto morgaŭ vizitos la apartamenton
• Morgaŭ la posedanto vizitos la apartamenton

They all mean basically the same thing, though the emphasis may shift slightly depending on what you place first.

It is simply one natural place to put a time word. Morgaŭ means tomorrow, and adverbs like this can often move around in Esperanto.

Putting it at the end is very normal and straightforward:

• La posedanto vizitos la apartamenton morgaŭ

But other positions are also possible, such as:

• Morgaŭ la posedanto vizitos la apartamenton
• La posedanto morgaŭ vizitos la apartamenton

Yes. Morgaŭ is used as a time adverb meaning tomorrow.

It tells you when the action happens, just like adverbs such as today, now, or soon in English.

Because visit in Esperanto, like visit in English, takes a direct object without a preposition.

So:

• viziti iun/ion = to visit someone/something

You do not need a word like to here. The verb directly takes the thing visited, and that object gets -n.

You would add -j for the plural, and the direct object would still keep -n.

So it would be:

• La posedantoj vizitos la apartamentojn morgaŭ.

Breakdown:

• posedanto → posedantoj = owners
• apartamento → apartamentojn = apartments, as a plural direct object

The full object ending becomes -jn when something is both plural and accusative.

Apartamento is the standard Esperanto word for apartment. It is a noun, so it ends in -o.

Like most Esperanto nouns:

• singular noun = -o
• plural noun = -oj
• direct object singular = -on
• direct object plural = -ojn

So:

• apartamento = apartment
• apartamenton = apartment as a direct object

Grammatically, Esperanto can omit la in some contexts, but that would usually change the meaning.

• La posedanto = the owner
• posedanto = an owner / owner in a more general sense
• la apartamenton = the apartment
• apartamenton = an apartment

So if the meaning shown to the learner is specifically the owner will visit the apartment tomorrow, then you should keep both instances of la.