Indonesian -kan verbs do not conjugate for tense, aspect, person, or number. The same derived stem remains inside the clause while separate words such as sudah, sedang, akan, bisa, tidak, belum, and jangan build temporal, modal, and negative meaning around it.
The main challenge is preserving two structures at once: preverbal particles stay separate and normally precede the predicate, while -kan remains attached to the stem across actor voice, passive, object voice, and imperatives. The broader particle system is introduced in the aspect and modality overview.
The core sequences
| Marker | Model | Interpretation |
|---|---|---|
| sudah | Ibu sudah membacakan anak itu buku | the benefactive reading event is complete |
| sedang | Petugas sedang memasukkan kunci | the caused motion is in progress |
| akan | Meja itu akan kami bersihkan | the cleaning is prospective |
| bisa | Tamu itu bisa dibukakan pintu | opening a door for the guest is possible |
| tidak | Ibu tidak membacakan anak itu buku | the reading event is negated |
| belum | Petugas belum memasukkan kunci | the expected insertion has not occurred yet |
| jangan | Jangan masukkan kunci itu | the addressee is told not to perform the action |
Ibu sudah membacakan Dira buku cerita yang baru.
Mother has already read Dira the new storybook.
Petugas sedang memasukkan kunci duplikat ke brankas.
The officer is putting the duplicate key into the safe.
Meja dekat pintu akan kami bersihkan setelah rapat.
We will clean the table near the door after the meeting.
Pengunjung itu bisa dibukakan pintu samping jika membawa kartu akses.
The side door can be opened for that visitor if they carry an access card.
Ayah tidak membacakan adik buku malam ini.
Dad is not reading my younger sibling a book tonight.
Petugas belum memasukkan kunci utama ke lemari besi.
The officer has not yet put the main key into the safe.
The predicate's shape reflects voice and valency, not time: membacakan, memasukkan, bersihkan, and dibukakan remain stable under their markers.
Particle placement across voice
In actor voice, particles follow the subject and precede meN-...-kan.
Guru sudah membacakan murid-murid hasil lomba.
The teacher has already read the competition results to the pupils.
Rani akan membersihkan meja setelah makan siang.
Rani will clean the table after lunch.
In di- passive, the particle follows the passive subject and precedes di-...-kan.
Murid-murid sudah dibacakan hasil lomba oleh guru.
The pupils have already been read the competition results by the teacher.
Pintu depan belum dibukakan untuk para peserta.
The front door has not yet been opened for the participants.
In pronoun-agent object voice, neutral Standard Indonesian puts the particle before the actor–stem unit.
Hasil lomba itu sudah saya bacakan kepada murid-murid.
I have already read those competition results to the pupils.
Kunci ini belum kami masukkan ke dalam kotak.
We have not yet put this key into the box.
Meja itu tidak akan mereka bersihkan hari ini.
They will not clean that table today.
The pronominal actor remains immediately before the stem: saya bacakan, kami masukkan, mereka bersihkan. Hasil itu saya sudah bacakan occurs in colloquial usage, but careful neutral order is hasil itu sudah saya bacakan.
All markers are separate words. Write sudah dibacakan, not sudahdibacakan; belum dimasukkan, not belumdimasukkan. The suffix stays attached: dibacakan, not dibaca kan.
Sudah: a completed event and its relevance
With dynamic -kan predicates, sudah normally presents the caused or benefactive event as completed by the reference time.
Nenek sudah membacakan cucunya dua cerita malam ini.
Grandma has already read her grandchild two stories tonight.
Semua kunci sudah dimasukkan ke kotak penyimpanan.
All the keys have already been put into the storage box.
Meja pemeriksaan sudah dibersihkan dengan disinfektan.
The examination table has already been cleaned with disinfectant.
Kami sudah dibukakan pintu darurat oleh teknisi.
The technician has already opened the emergency door for us.
Sudah does not itself say exactly when the event happened. A time expression or discourse supplies that information.
Compare a completed caused event with the resulting state:
Petugas sudah membersihkan meja itu.
The officer has cleaned that table.
Meja itu sudah bersih.
That table is already clean.
The first asserts a cleaning event and actor; the second only attributes a clean state. English the table is clean does not justify dropping -kan when the Indonesian sentence is about who performed the cleaning.
Sedang: viewing the caused event from inside
Sedang presents an activity or process as ongoing. It combines readily with reading, insertion, and cleaning.
Kakak sedang membacakan adik pesan dari Ibu.
My older sibling is reading my younger sibling a message from Mom.
Teknisi sedang memasukkan kabel ke saluran bawah lantai.
The technician is feeding a cable into the channel beneath the floor.
Dua petugas sedang membersihkan meja-meja di aula.
Two officers are cleaning the tables in the hall.
Caused-motion memasukkan has an endpoint: the theme ends up inside. Sedang selects the path toward that endpoint and does not entail completion.
Saat listrik padam, petugas sedang memasukkan kartu ke mesin.
When the power went out, the officer was inserting the card into the machine.
Saat listrik padam, petugas sudah memasukkan kartu ke mesin.
When the power went out, the officer had already inserted the card into the machine.
The same contrast applies to resultatives. Sedang membersihkan describes the process; sudah membersihkan says the actor has completed a relevant cleaning event.
Stative bersih behaves differently:
Mejanya sedang bersih dan belum dipakai.
The table happens to be clean at the moment and has not been used yet.
This marked temporary-state use of sedang bersih is possible, but ordinary Indonesian more often says mejanya bersih sekarang. Dynamic sedang membersihkan meja is fully neutral.
Akan: prediction, plan, or schedule
Akan places the event after the reference time. An animate actor can support an intentional plan, while an agentless passive more readily sounds scheduled or predicted.
Besok Ibu akan membacakan anak-anak buku yang kedua.
Tomorrow Mother will read the children the second book.
Petugas akan memasukkan kode baru setelah sistem dimulai ulang.
The officer will enter the new code after the system restarts.
Meja pendaftaran akan dibersihkan sebelum pintu dibuka.
The registration table will be cleaned before the doors open.
Setiap peserta akan dibukakan pintu setelah identitasnya diperiksa.
A door will be opened for each participant after their identity is checked.
In neutral negative order, tidak precedes akan:
Tanpa surat izin, petugas tidak akan membukakan kami pintu belakang.
Without an authorization letter, the officer will not open the back door for us.
Akan tidak membukakan is possible in marked contrastive or analytical prose, where future nonperformance itself is being classified, but tidak akan membukakan is the ordinary “will not open for.”
Bisa: ability, permission, and circumstantial possibility
With an actor subject, bisa may describe ability or permission. With a passive subject, it often describes whether the event is possible under the circumstances.
Guru itu bisa membacakan buku dalam dua bahasa.
That teacher can read books aloud in two languages.
Petugas bisa memasukkan data secara manual jika jaringan mati.
The officer can enter the data manually if the network is down.
Noda ini masih bisa dibersihkan dengan sabun biasa.
This stain can still be cleaned with ordinary soap.
Tamu tanpa kendaraan bisa dibukakan pintu pejalan kaki.
The pedestrian gate can be opened for guests without vehicles.
Scope changes with order:
Petugas tidak bisa memasukkan kartu yang rusak itu.
The officer cannot insert that damaged card.
Petugas bisa tidak memasukkan kartu itu jika datanya sudah tersimpan.
The officer can choose not to insert that card if its data is already stored.
Tidak bisa memasukkan negates ability or possibility. Bisa tidak memasukkan places negation inside the option: non-insertion is available as a choice. The second reading requires a controlling actor and a context where omission is permitted.
Tidak, belum, and sudah tidak
Use tidak for plain event negation. Use belum when an expected event has not occurred yet.
Ibu tidak membacakan anak-anak buku pada hari libur.
Mother does not read the children books on holidays.
Ibu belum membacakan anak-anak buku yang baru.
Mother has not yet read the children the new book.
Kunci itu tidak dimasukkan ke brankas karena masih dipakai.
That key is not put in the safe because it is still in use.
Kunci itu belum dimasukkan ke brankas.
That key has not yet been put in the safe.
With sudah tidak, a previous habit or phase has ended.
Sejak pindah gedung, petugas sudah tidak membersihkan meja itu.
Since moving buildings, the staff no longer clean that table.
Meja itu belum dibersihkan setelah acara tadi malam.
That table has not yet been cleaned after last night's event.
English not covers both contrasts. Indonesian explicitly distinguishes cessation (sudah tidak) from a pending endpoint (belum).
Several markers can combine in the preverbal field:
Pengunjung itu belum bisa dibukakan pintu samping karena kuncinya belum ditemukan.
The side door cannot yet be opened for that visitor because the key has not been found.
Buku tersebut mungkin belum akan dibacakan minggu ini.
That book may not yet be read aloud this week.
The exact order follows scope: belum bisa means ability has not been reached yet; mungkin takes scope over the entire proposition.
Jangan: prohibiting a controlled action
Jangan addresses an understood controller and precedes the predicate. Direct commands often use a bare imperative stem, while full meN-...-kan forms are also standard, especially in formal prohibitions. -Kan stays in either form.
Jangan memasukkan kunci basah ke lubang itu.
Do not insert a wet key into that keyhole. (formal)
Jangan bersihkan layar dengan cairan berbahan alkohol.
Do not clean the screen with an alcohol-based liquid.
Jangan bacakan anak-anak bagian yang menakutkan itu.
Do not read the children that frightening part.
A passive directive can prohibit staff from carrying out an action without naming them:
Jangan dibukakan pintu untuk siapa pun setelah pukul sepuluh.
Do not open the door for anyone after ten.
The addressee controls whether the event is arranged. By contrast, an inanimate theme cannot obey a command; Kunci jangan memasukkan wrongly makes the key sound like the inserting actor.
Why bukan is normally wrong
Ordinary -kan predicates take tidak, not bukan. Use bukan to contrast a focused noun phrase or one proposition with another.
Rina tidak membersihkan meja itu.
Rina does not clean that table.
Bukan meja itu yang dibersihkan Rina, melainkan meja dekat pintu.
It was not that table that Rina cleaned, but the one near the door.
Bukan petugas yang memasukkan kunci itu ke laci.
It was not the officer who put that key into the drawer.
In the last two examples, bukan negates the focused participant selected by yang; it is not placed directly before the verb as an ordinary verbal negator.
Common Mistakes
1. Moving the aspect marker after the predicate
❌ Petugas memasukkan sudah kunci ke brankas.
Incorrect order—sudah precedes the predicate.
✅ Petugas sudah memasukkan kunci ke brankas.
The officer has already put the key into the safe.
2. Attaching a separate marker
❌ Ibu sedangmembacakan adik sebuah cerita.
Incorrect spelling—sedang is a separate word.
✅ Ibu sedang membacakan adik sebuah cerita.
Mother is reading my younger sibling a story.
3. Using bukan for verbal negation
❌ Raka bukan membersihkan meja setelah rapat.
Incorrect for plain event negation—use tidak.
✅ Raka tidak membersihkan meja setelah rapat.
Raka does not clean the table after the meeting.
4. Translating English “has not” as tidak sudah
❌ Kami tidak sudah memasukkan kunci cadangan.
Incorrect marker combination for an event that has not happened yet.
✅ Kami belum memasukkan kunci cadangan.
We have not yet put away the spare key.
5. Dropping -kan after a particle or voice change
❌ Tamu itu belum dibuka pintu oleh penjaga.
Incorrect for the beneficiary passive—the stem must retain -kan.
✅ Tamu itu belum dibukakan pintu oleh penjaga.
The guard has not yet opened a door for that guest.
Key Takeaways
- The -kan stem remains constant; separate particles build aspect, modality, future, and negation before it.
- Sudah presents a completed relevant event, while sedang views the event from inside and belum marks an expected endpoint as pending.
- Akan can express plan, schedule, or prediction; bisa varies between ability, permission, and circumstantial possibility.
- Particle order determines scope: tidak bisa V differs from bisa tidak V.
- Use jangan with an understood controller and tidak, not bukan, for ordinary predicate negation.
- In object voice, particles precede the actor–stem unit: sudah saya bacakan, belum kami masukkan.
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