La koncerto komenciĝas ĝuste nun.

It is the present-tense form of komenciĝi.

Breakdown:

• komenc- = the idea of beginning or starting
• -iĝ- = becoming, coming into a state, happening by itself
• -as = present tense

So komenciĝas means begins / is beginning in an intransitive sense: the subject itself is entering the state of having begun.

In this sentence, La koncerto komenciĝas means that the concert is beginning.

Because Esperanto usually distinguishes between:

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

So:

• La organizanto komencas la koncerton = The organizer starts the concert.
• La koncerto komenciĝas = The concert begins.

For an English speaker, this is one of the big habits to learn: Esperanto often marks the difference between doing something to an object and something happening on its own more clearly than English does.

Because Esperanto does not have a separate mandatory progressive form like English is beginning.

The ending -as covers present time in general. Depending on context, it can be translated as:

• begins
• is beginning
• sometimes even does begin

Here, ĝuste nun makes it clear that the action is happening at this very moment, so English naturally uses is beginning or is starting.

No. Esperanto verbs do not change for person or number.

That means the same verb form is used with:

• mi
• vi
• li/ŝi/ĝi
• ni
• ili

So you get:

• Mi komenciĝas would be grammatically the same verb ending
• La koncertoj komenciĝas also keeps komenciĝas

The plural is shown on the noun, not on the verb:

• La koncerto komenciĝas = The concert is beginning.
• La koncertoj komenciĝas = The concerts are beginning.

Here ĝuste means something like:

• exactly
• precisely
• right

So ĝuste nun means right now or exactly now.

Without ĝuste, nun would simply mean now. Adding ĝuste gives extra precision or emphasis.

No. In nun, the n is part of the word itself.

nun is an adverb meaning now. It is not a noun receiving the accusative ending.

That is important because English speakers often learn that -n marks the direct object, and then start seeing accusatives everywhere. But in this case:

• koncerto = noun
• nun = adverb

So there is no accusative on nun here.

La is the definite article, meaning the.

So la koncerto means the concert, not just a concert or concert in a general sense.

It suggests that the speaker has a specific concert in mind, something known from context. For example:

• the concert we are waiting for
• the concert on the program
• the concert everyone is talking about

If you removed la, the sentence would sound less natural in many normal contexts.

Yes. Esperanto word order is fairly flexible.

The given order, La koncerto komenciĝas ĝuste nun, is a very neutral way to say it.

But these are also possible:

• Ĝuste nun la koncerto komenciĝas.
• Nun la koncerto komenciĝas.

Changing the order usually changes focus or emphasis, not the basic meaning.

For example:

• La koncerto komenciĝas ĝuste nun = neutral statement
• Ĝuste nun la koncerto komenciĝas = stronger emphasis on right now

A few useful pronunciation points:

• c is pronounced like ts
• ĝ is pronounced like the j in judge
• stress in Esperanto normally falls on the second-to-last syllable

So:

• koncerto → kon-CER-to
• komenciĝas → ko-men-CI-ĝas
• ĝuste → ĜUS-te

That gives the sentence this stress pattern:

• la kon-CER-to ko-men-CI-ĝas ĜUS-te nun

Yes. Both are reasonable English translations.

Because Esperanto -as does not force a distinction between simple present and progressive, the exact English wording depends on what sounds natural in context.

With ĝuste nun, English usually prefers:

• The concert is beginning right now
• The concert is starting right now

But The concert begins right now is also possible, especially if you are emphasizing a scheduled start time.