Ni komencos la vojaĝon je la sesa.

In Esperanto, -os marks the future tense.

• komenci = to begin / to start
• komencas = begin / am beginning / starts
• komencis = began
• komencos = will begin / will start

So Ni komencos means we will begin or we will start.

Ni means we.

Esperanto verbs do not change depending on the subject, so:

• mi komencos = I will start
• vi komencos = you will start
• li komencos = he will start
• ni komencos = we will start

Even though the verb form stays the same, the subject is usually stated clearly, especially in normal sentences. So Ni komencos simply tells us that we are the ones who will begin the journey.

The -n marks the direct object.

Here, the thing being started is the journey, so la vojaĝo becomes la vojaĝon.

• la vojaĝo = the journey
• Ni komencos la vojaĝon = We will begin the journey

In Esperanto, the direct object normally takes -n.

La is the definite article, meaning the.

So:

• vojaĝo = a journey / journey
• la vojaĝo = the journey

In this sentence, the speaker means a specific journey, so la is used.

Here je is being used to indicate time: at.

So je la sesa means at six or more literally at the sixth (hour).

Esperanto often uses je when no more specific preposition is clearly required, especially with clock times.

For example:

• je la tria = at three
• je la oka = at eight

Sesa is the ordinal form of ses:

• ses = six
• sesa = sixth

In time expressions like this, Esperanto often uses an understood noun such as horo (hour). So je la sesa literally means something like:

• at the sixth hour

That is why you see the ordinal sesa instead of the plain number ses.

This is a standard way to express clock time in Esperanto.

La sesa means the sixth (hour). The noun horo is understood and usually left out.

So:

• je la sesa = at six o’clock
• literally: at the sixth [hour]

The article la belongs to that understood expression.

Yes. In normal usage, je la sesa is most naturally understood as a time expression, meaning at six o’clock.

Because of the preposition je, the phrase strongly suggests a point in time. If someone wanted to talk about the sixth day or the sixth date, the sentence would usually need more context or a clearer noun.

So in this sentence, learners should understand je la sesa as at six.

Not naturally in the same way. The sentence uses komencos, from komenci, which means to begin/start.

The prefix ek- often means to start suddenly or to begin doing something, but it usually attaches to a verb describing an action:

• kanti = to sing
• ekkanti = to start singing

With komenci, you already have the idea of beginning, so komencos is the normal and straightforward choice here.

Esperanto word order is fairly flexible, but the most neutral order here is:

• Ni komencos la vojaĝon je la sesa.

Because vojaĝon has the object marker -n, you could move parts around and still keep the meaning clear. But for learners, it is best to use the standard order:

subject + verb + object + time

That makes the sentence easy to understand and natural.