Kakak perempuan saya juga kelupaan jadwal piket, padahal namanya sudah tertulis di papan pengumuman.

Kakak means older sibling and does not by itself tell you whether the sibling is male or female.

So:

• kakak saya = my older sibling
• kakak perempuan saya = my older sister
• kakak laki-laki saya = my older brother

In everyday Indonesian, people often just say kakak saya if the gender is already clear from context. Here, perempuan is added to make it explicit.

Not exactly. Kakak means older sibling, so it is age-based, not only gender-based.

Compare:

• kakak = older sibling
• adik = younger sibling

If you want to specify gender:

• kakak perempuan = older sister
• kakak laki-laki = older brother
• adik perempuan = younger sister
• adik laki-laki = younger brother

So kakak perempuan saya is literally my female older sibling.

In Indonesian, possession usually comes after the noun.

So:

• rumah saya = my house
• buku saya = my book
• kakak perempuan saya = my older sister

This is different from English, where my comes before the noun.

Juga means also, too, or as well.

In this sentence:

• Kakak perempuan saya juga kelupaan jadwal piket
  = My older sister also forgot the duty schedule.

It shows that someone else probably forgot it too, and now the speaker’s older sister did as well.

Its placement is flexible in Indonesian, but here it naturally follows the subject:

• Kakak perempuan saya juga ...

That is a very common position for juga.

This is a very common learner question.

• lupa = to forget
• kelupaan = to accidentally forget / to end up forgetting / to forget without intending to

The form ke-...-an often gives a nuance of something happening unintentionally or beyond the person’s control.

So:

• Saya lupa jadwalnya = I forgot the schedule.
• Saya kelupaan jadwalnya = I accidentally forgot the schedule / It slipped my mind.

In this sentence, kelupaan sounds natural because it suggests an unintentional lapse.

In practical terms for learners, you can treat it as a predicate meaning accidentally forgot or slipped one’s mind.

For example:

• Saya kelupaan bawa kunci.
  = I forgot to bring the keys.
• Dia kelupaan jadwal rapat.
  = She accidentally forgot the meeting schedule.

So even if grammar books may classify it in different ways depending on analysis, the safest learner understanding is: kelupaan functions like the main predicate here.

Jadwal = schedule
Piket = duty shift / assigned turn for routine duty

So jadwal piket means something like:

• duty schedule
• duty roster
• shift schedule
• cleaning-duty schedule

In Indonesian-speaking contexts, piket is often used for things like:

• students taking turns cleaning the classroom
• staff taking turns being on duty
• assigned shifts or routine responsibilities

So the exact English translation depends on context, but duty schedule is a good general translation.

Because kelupaan can directly take what was forgotten.

So:

• kelupaan jadwal piket
• lupa jadwal piket

both work without a preposition.

This is similar to English forget the schedule, not forget about the schedule in every case.

Padahal is a very useful conjunction. It often means:

• even though
• even when
• whereas
• despite the fact that
• and yet

In this sentence, it introduces a contrast:

• Kakak perempuan saya juga kelupaan jadwal piket, padahal namanya sudah tertulis di papan pengumuman.

The idea is: she forgot the duty schedule, even though her name was already written on the notice board.

So padahal often carries a sense of this is surprising or contrary to what you would expect.

Sometimes in loose translation, yes, but it is more specific than but.

Padahal usually signals: the second part makes the first part surprising, contradictory, or ironic.

Compare:

• tetapi/tapi = but
• padahal = even though / whereas / despite the fact that

So here padahal is better understood as even though than plain but.

Namanya = his/her name or the name

It comes from:

• nama = name
• -nya = his/her/its, or sometimes the

In this sentence, -nya refers to kakak perempuan saya, so:

• namanya = her name

Thus:

• padahal namanya sudah tertulis ... = even though her name was already written ...

Because Indonesian often avoids repetition when the reference is already clear.

So instead of saying:

• padahal nama kakak perempuan saya sudah tertulis ...

it is more natural to say:

• padahal namanya sudah tertulis ...

This is shorter and smoother. The -nya clearly refers back to the older sister.

This is an important distinction.

• tertulis = written, in a written state, already appearing in writing
• ditulis = written by someone, focusing more on the action done to it

In this sentence:

• namanya sudah tertulis di papan pengumuman

the focus is on the result/state: her name was already written there / her name was already on the board

So tertulis is very natural here because the sentence cares more about the fact that the name was there, not about who wrote it.

Sudah means already, and tertulis means written.

So:

• sudah tertulis = already written / already listed

It emphasizes that the information was available before the forgetting happened.

That is why it strengthens the contrast with padahal: she forgot, even though it was already written down.

Because di marks location here.

• di = in, on, at
• papan pengumuman = notice board / announcement board / bulletin board

So:

• di papan pengumuman = on the notice board

This di is the preposition for place, not the passive prefix di- attached to a verb.

Literally:

• papan = board
• pengumuman = announcement

So papan pengumuman is literally announcement board, which in natural English is usually:

• notice board
• bulletin board

Yes:

• Kakak perempuan saya = my older sister
• juga = also
• kelupaan = accidentally forgot / forgot
• jadwal piket = duty schedule / duty roster
• padahal = even though / whereas
• namanya = her name
• sudah = already
• tertulis = written / listed
• di papan pengumuman = on the notice board

A natural full translation would be:

My older sister also forgot the duty schedule, even though her name was already written on the notice board.

Yes, it sounds natural.

It has a very everyday feel, especially because of:

• kelupaan, which sounds conversational and natural
• padahal, which is commonly used to show contrast
• namanya sudah tertulis, which is a normal way to say the information was already posted

A slightly simpler version could be:

• Kakak perempuan saya juga lupa jadwal piket, padahal namanya sudah tertulis di papan pengumuman.

That is also correct, but kelupaan adds a nuance of it slipped her mind.

The sentence has two clauses:

1. Kakak perempuan saya juga kelupaan jadwal piket
   = My older sister also forgot the duty schedule

2. padahal namanya sudah tertulis di papan pengumuman
   = even though her name was already written on the notice board

So the overall pattern is:

[main statement] + padahal + [contrasting fact]

This pattern is very common in Indonesian when you want to show that something happened despite clear information or contrary expectations.