Kami mengisi minyak pada waktu puncak.

Malay makes a distinction that English does not:

• kami = we, but not including the person being spoken to
• kita = we, including the person being spoken to

So Kami mengisi minyak... means the speaker and some others did this, but the listener was not part of the group.

If the listener was included, you would say Kita mengisi minyak pada waktu puncak.

Mengisi comes from the root isi, which means contents, to fill, or to put into depending on context.

With the prefix meN-, it becomes a verb:

• isi = fill / contents
• mengisi = to fill, to put in, to refill

In this sentence, mengisi minyak is a very common expression meaning to fill up with fuel or to refuel.

In Malay, the bare root often needs a prefix when it functions as a normal active verb in a sentence.

So:

• isi = root word
• mengisi = active verb to fill

This is very common in Malay. Compare:

• baca → membaca = to read
• guna → menggunakan = to use
• isi → mengisi = to fill

Using mengisi makes the sentence sound natural and complete as a standard statement.

Literally, minyak often means oil. But in the expression mengisi minyak, it usually means fuel/petrol/gas in everyday usage.

So in this sentence, it is best understood as:

• to refuel
• to fill up the car with petrol/gas

Malay often uses broader words where English would choose a more specific one from context.

It is partly literal, but also a standard set phrase.

Word by word, it looks like fill oil/fuel, but in real usage it usually means to get fuel, to fill up, or to refuel a vehicle.

So a learner should recognize it as a common expression, not just translate each word mechanically.

Pada waktu puncak means during peak time or at peak hours.

Breakdown:

• pada = at / on / during
• waktu = time
• puncak = peak / highest point

Together, waktu puncak means peak time, often like rush hour or any busiest period.

Pada is a preposition that can mean at, on, or during, especially with time expressions.

So:

• pada waktu puncak = at/during peak hours

In Malay, time expressions can sometimes appear without a preposition, but pada makes the relationship clearer and sounds natural in many contexts.

Yes, you could.

• pada waktu puncak = at/during peak time
• semasa waktu puncak = during peak time

Both are understandable. Semasa can sound a little more explicitly like during, while pada is a very common general preposition for time expressions.

Mostly yes. The sentence follows a straightforward pattern:

• Kami = subject
• mengisi minyak = verb phrase
• pada waktu puncak = time phrase

So the structure is roughly:

We + refuelled/refuel + during peak hours

Malay word order is often similar to English in simple statements.

Malay verbs do not change form for tense the way English verbs do.

So Kami mengisi minyak pada waktu puncak could mean:

• We refuel during peak hours
• We were refuelling during peak hours
• We refuelled during peak hours

The exact time usually comes from context, or from extra words such as:

• sudah = already
• telah = already / formal past
• sedang = in progress
• akan = will

Examples:

• Kami sudah mengisi minyak pada waktu puncak. = We already refuelled during peak hours.
• Kami sedang mengisi minyak pada waktu puncak. = We are refuelling during peak hours.
• Kami akan mengisi minyak pada waktu puncak. = We will refuel during peak hours.

Malay does not normally use articles like English a, an, and the.

So Malay often leaves nouns bare:

• minyak = fuel / the fuel / some fuel
• waktu puncak = peak time / the peak period

The listener understands the meaning from context instead of articles.

Yes, sometimes.

Malay often allows subjects to be omitted when the meaning is clear from context. So in conversation, someone might simply say:

• Mengisi minyak pada waktu puncak.

But in a full, clear sentence—especially for learners—keeping kami is very normal and helpful.

A rough pronunciation guide is:

• Kami → KAH-mee
• mengisi → muh-ngEE-see
• minyak → MEEN-yak
• pada → PAH-dah
• waktu → WAK-too
• puncak → POON-chak

A natural rhythm would be:

KAH-mee muh-ngEE-see MEEN-yak pah-dah WAK-too POON-chak

Malay pronunciation is usually quite regular compared with English spelling.