La kuracado komenciĝos morgaŭ.

It has three main parts:

• komenc- = begin, start
• -iĝ- = become, get into a state, begin by itself
• -os = future tense

So komenciĝos means will begin.

Because the sentence is talking about the treatment itself coming to its beginning.

In Esperanto, -iĝ- often makes a verb intransitive or shows a change of state. So:

• komenci = to begin something
• komenciĝi = to begin, to start

Here, la kuracado is not beginning something else. It is the thing that begins. So komenciĝos is the natural form.

-os is the regular Esperanto ending for the future tense.

So:

• komenciĝas = begins / is beginning
• komenciĝis = began
• komenciĝos = will begin

Esperanto does not need a separate word like will. The ending itself shows the tense.

Kuracado comes from:

• kurac- = treat medically, care for medically
• -ad- = ongoing, repeated, or extended action
• -o = noun

So kuracado means treatment, especially as a process or course of treatment, not just one single momentary act.

La is the definite article, like the in English.

So la kuracado means the treatment — a specific treatment already known from the context.

Without la, kuracado would sound more general or less specifically identified.

Because kuracado is the subject of the sentence, not the direct object.

The thing that will begin is the treatment, so it stays in the basic noun form:

• la kuracado = the treatment

If it were a direct object, it would take -n:

• La kuracisto komencos la kuracadon morgaŭ.
  The doctor will begin the treatment tomorrow.

Because morgaŭ is already an adverb of time meaning tomorrow.

So it can stand by itself:

• La kuracado komenciĝos morgaŭ.

You do not need je or another preposition here.

No. It is not a passive form.

It is an active intransitive form meaning that the subject itself begins.

A true passive in Esperanto uses esti plus a participle, for example:

• La kuracado estos komencita morgaŭ.

That would mean something more like The treatment will be started tomorrow.

But La kuracado komenciĝos morgaŭ is the more natural way to say The treatment will begin tomorrow.

Yes. Esperanto word order is flexible.

These are all possible:

• La kuracado komenciĝos morgaŭ.
• Morgaŭ la kuracado komenciĝos.
• La kuracado morgaŭ komenciĝos.

The version with morgaŭ at the end is a very neutral, natural order.

A helpful breakdown is:

• la ku-ra-CA-do ko-men-CI-ĝos MOR-gaŭ

Key pronunciation points:

• c sounds like ts
• ĝ sounds like English j
• aŭ sounds roughly like ow
• stress is always on the next-to-last syllable

So:

• kuracado → ku-ra-CA-do
• komenciĝos → ko-men-CI-ĝos
• morgaŭ → MOR-gaŭ

For a learner, it is best to use komenciĝos here.

Why? Because komenci often suggests that something begins something else, while komenciĝi clearly means to begin.

So:

• La kuracisto komencos la kuracadon morgaŭ.
  The doctor will begin the treatment tomorrow.

But when the treatment itself is the subject, komenciĝos is the clearest and most standard choice.

Then you would make that person the subject, and the treatment would become the direct object:

• La kuracisto komencos la kuracadon morgaŭ.

That is different from the original sentence:

• La kuracado komenciĝos morgaŭ.

The original focuses on the treatment beginning, not on who starts it.