Kereta terakhir berangkat jam lima, jadi kami harus datang lebih awal.

In Indonesian, modifiers usually come after the noun. So:

• kereta terakhir = the last train
• rumah besar = big house
• buku baru = new book

This is the normal noun + adjective order in Indonesian.

Indonesian does not usually use articles like the or a/an. Whether something is definite or indefinite is often understood from context.

So kereta terakhir can naturally mean:

• the last train
• sometimes just last train

In this sentence, English uses the, but Indonesian does not need a separate word for it.

Here, kereta means train. In modern everyday Indonesian, kereta is often understood as train, especially in contexts like travel schedules.

You may also see:

• kereta api = train more explicitly

In this sentence, kereta terakhir clearly means the last train.

Berangkat is commonly used for departing or setting off, especially for transportation or the start of a journey.

• Kereta berangkat jam lima = The train leaves at five
• Saya berangkat ke kantor jam tujuh = I leave for the office at seven

Pergi means to go, but it is more general. In a sentence about a train schedule, berangkat sounds more natural than pergi.

Indonesian often does not need a preposition equivalent to English at when giving clock time.

So:

• berangkat jam lima = leaves at five
• saya datang jam enam = I come at six

You can also sometimes hear pukul lima, which is a bit more formal or explicit:

• berangkat pukul lima = leaves at five o’clock

Yes, jadi can mean different things depending on context.

In this sentence, jadi means:

• so
• therefore

So:

• Kereta terakhir berangkat jam lima, jadi kami harus datang lebih awal. = The last train leaves at five, so we have to come earlier.

But in other contexts, jadi can mean become, for example:

• Dia jadi guru. = He became a teacher.

This is a very common Indonesian word with several uses.

Indonesian distinguishes between two kinds of we:

• kami = we, but not including the listener
• kita = we, including the listener

So kami harus datang lebih awal means:

• we have to come earlier
• but you are not included in that we

If the speaker wanted to include the person they were talking to, they would say kita instead.

After modal-like verbs such as harus (must / have to), Indonesian does not use an equivalent of English to.

So:

• harus datang = have to come
• harus pergi = have to go
• harus belajar = must study

This is normal Indonesian structure:

• subject + harus + verb

Literally:

• lebih = more
• awal = early / earlier

Together, lebih awal means earlier.

Indonesian often forms comparatives with lebih:

• lebih besar = bigger / more big
• lebih cepat = faster
• lebih awal = earlier

Even if English uses a single word like earlier, Indonesian commonly uses lebih + adjective/adverb.

In Indonesian, just like in English, the comparison point can be left understood from context.

So kami harus datang lebih awal means:

• we have to come earlier
• understood as earlier than usual, earlier than five, or earlier than we planned, depending on context

If you want to state the comparison explicitly, you can add it:

• lebih awal dari biasanya = earlier than usual
• lebih awal dari jam lima = earlier than five o’clock

Datang can mean come, and in many contexts it can also be translated as arrive, depending on what sounds natural in English.

So kami harus datang lebih awal could be understood as:

• we have to come earlier
• we have to arrive earlier

Indonesian often uses datang where English might prefer arrive, especially when talking about getting to a place.

The comma is natural here because the sentence has two clauses:

• Kereta terakhir berangkat jam lima
• jadi kami harus datang lebih awal

The comma helps show the pause and the logical connection: The last train leaves at five, so...

In informal writing, punctuation may vary, but this comma is perfectly normal and helpful.