Kami tidak bertaruh di kantor.

Because Indonesian has two different words for we:

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

So Kami tidak bertaruh di kantor means the speaker is talking about their group, but not necessarily including the person they are speaking to.

Indonesian does not use an auxiliary verb like English do in sentences such as we do not bet.

Instead, it simply puts the negative word tidak before the verb:

• tidak bertaruh = not bet

So the structure is very straightforward:

• Kami = we
• tidak = not
• bertaruh = bet / gamble
• di kantor = at/in the office

Use tidak to negate verbs and adjectives.

Here, bertaruh is a verb, so tidak is correct:

• Kami tidak bertaruh = We do not bet

Bukan is usually used to negate nouns or noun phrases, especially in identification or classification:

• Itu bukan kantor = That is not an office
• Saya bukan guru = I am not a teacher

So in this sentence, bukan would be wrong.

The prefix ber- often forms an intransitive verb, often describing an action that the subject does.

In bertaruh, it helps form the verb meaning to bet or to gamble.

A useful learner point is this: although prefixes often have patterns, it is best to learn bertaruh as a complete word. Indonesian affixes are helpful, but not every word can be understood perfectly by breaking it into pieces.

Yes. Indonesian often allows a verb like bertaruh to stand by itself if the general activity is what matters.

So:

• Kami tidak bertaruh di kantor
  is perfectly natural.

If you want to add more detail, you can:

• say what is being bet
• say what the bet is about
• say with whom or where

But you do not have to.

Because di here is a preposition, meaning in, at, or sometimes on, depending on context.

Prepositions are written separately:

• di kantor = at/in the office
• di rumah = at home
• di sekolah = at school

This is different from the prefix di-, which attaches directly to a verb in passive forms:

• ditulis = written
• dibuka = opened

So:

• di kantor ✅
• dikantor ❌

It can be translated either way depending on context.

Indonesian di is a general location preposition, so English may translate it as:

• in
• at
• sometimes on

In this sentence, English would most naturally say either:

• at the office
• in the office

Both match di kantor.

Indonesian usually does not use articles like English a, an, and the.

So kantor can mean:

• office
• an office
• the office

The exact meaning depends on context.

That is very normal in Indonesian. A bare noun is often enough.

Indonesian verbs usually do not change form for tense.

So Kami tidak bertaruh di kantor can mean different things depending on context, such as:

• we do not bet at the office
• we are not betting at the office
• we do not usually bet at the office

If the speaker wants to be more specific, they can add a time word:

• sekarang = now
• kemarin = yesterday
• besok = tomorrow
• biasanya = usually

Without a time word, the sentence is neutral and context decides the time reference.

The normal word order here is:

• subject + tidak + verb + place

So:

• Kami tidak bertaruh di kantor

That is the most neutral and natural order.

You can move the location phrase for emphasis:

• Di kantor, kami tidak bertaruh.

This sounds like As for at the office, we do not bet or At the office, we do not bet.

But the original order is the best basic pattern to learn first.

In casual speech, tidak is often replaced by nggak or gak:

• Kami nggak bertaruh di kantor.
• Kami gak bertaruh di kantor.

This is very common in conversation.

The version with tidak is more neutral and standard, so it is a good form for learners to know well first.