The grammatical subject is the noun phrase that a clause organizes as its central grammatical starting point. In a simple actor-voice sentence, it is often also the person performing the action. Across Indonesian voice, existential, adjective, and zero-subject constructions, however, “who did it?” is not a reliable subject test.
Indonesian offers no subject–verb agreement or overt nominative case ending. Identifying a subject therefore requires converging evidence from position, predicate type, voice, referentiality, relativization, and discourse.
For a full comparison of actor and patient alignment, see voice-system arguments.
Begin with the predicate, not the actor
First find the clause's predicate. Then ask which noun phrase the predicate makes an assertion about.
Rina membuka jendela kamar.
Rina opens the bedroom window.
Rina ketua kelompok kami.
Rina is the leader of our group.
Rina sangat sabar menghadapi pelanggan.
Rina is very patient in dealing with customers.
Rina di ruang rapat lantai dua.
Rina is in the meeting room on the second floor.
In all four clauses, Rina is the subject. The predicates are respectively verbal, nominal, adjectival, and prepositional. A subject does not require a following verb, and Indonesian does not insert a copula merely to make the subject visible.
Prepredicate position: useful but not sufficient
The neutral Indonesian subject usually precedes its predicate.
Kereta dari Yogyakarta tiba pukul enam.
The train from Yogyakarta arrives at six.
Anak tetangga itu sedang bermain di halaman.
The neighbor's child is playing in the yard.
Harga tiketnya cukup mahal bagi mahasiswa.
The ticket price is fairly expensive for students.
The bracketable phrases kereta dari Yogyakarta, anak tetangga itu, and harga tiketnya occur before what is predicated of them. But clause-initial position alone does not prove subjecthood.
Kemarin, anak tetangga itu bermain di halaman belakang.
Yesterday, the neighbor's child played in the backyard.
Di halaman belakang, anak tetangga itu menemukan anak kucing.
In the backyard, the neighbor's child found a kitten.
Kemarin is a time setting and di halaman belakang is a prepositional setting. The subject in both sentences is still anak tetangga itu. Fronted circumstances do not become subjects by moving to the left edge.
Referentiality and definiteness
Subjects commonly refer to an identifiable participant: a proper name, pronoun, definite noun phrase, or established topic.
Buku biru itu milik kepala sekolah.
That blue book belongs to the principal.
Mereka belum menerima jadwal terbaru.
They have not received the latest schedule yet.
Kepala sekolah yang baru akan berkunjung besok.
The new principal will visit tomorrow.
This tendency is not an absolute rule. Indefinite and generic subjects are possible when the clause presents them appropriately.
Seorang tamu menunggu di depan ruang direktur.
A guest is waiting outside the director's office.
Kucing menyukai tempat yang hangat.
Cats like warm places. (generic)
Beberapa warga menolak rencana perluasan jalan.
Several residents oppose the road-widening plan.
Definiteness is therefore a strong discourse tendency, not a morphological requirement. A demonstrative such as itu can help close a long subject phrase, but its absence does not prove that the phrase is not a subject.
Actor voice: actor as subject
In actor voice, the actor subject precedes an actor-voice predicate, commonly with meN-.
Petugas memeriksa semua kartu identitas di pintu masuk.
The officer checks all identity cards at the entrance.
Nadia mengirim hasil pemeriksaan kepada kepala unit.
Nadia sends the inspection results to the unit head.
Para teknisi sedang memperbaiki jaringan utama.
The technicians are repairing the main network.
Here petugas, Nadia, and para teknisi are both grammatical subjects and event initiators. This alignment is common enough that learners overgeneralize it—but other voices deliberately break the alignment.
Di-passive: patient as subject
In a di- passive, the patient is promoted to subject position. The actor, if expressed, follows the verb or an oleh phrase.
Semua kartu identitas diperiksa petugas di pintu masuk.
All identity cards are checked by the officer at the entrance.
Hasil pemeriksaan dikirim Nadia kepada kepala unit.
The inspection results are sent by Nadia to the unit head.
Jaringan utama sedang diperbaiki oleh para teknisi.
The main network is being repaired by the technicians.
The semantic actors remain petugas, Nadia, and para teknisi, but the subjects are semua kartu identitas, hasil pemeriksaan, and jaringan utama. Calling the postverbal actor “the subject” confuses semantic role with grammatical voice.
Object voice: patient first, pronominal actor before the base
Object voice also places the patient in the privileged clause-initial subject or pivot position. A pronominal actor stands immediately before the bare or suffixed verb.
Dokumen ini sudah saya baca sampai halaman terakhir.
I have read this document through the last page.
Masalah tersebut harus kita bicarakan hari ini.
We must discuss that issue today.
Undangan itu belum mereka kirim kepada semua peserta.
They have not yet sent that invitation to all participants.
In dokumen ini sudah saya baca, the grammatical subject or pivot is dokumen ini; saya identifies the actor inside the predicate. It is tempting to call saya the subject because it translates as English “I,” but English has reorganized the clause into actor-first active voice.
Some linguistic frameworks reserve subject for a narrower set of Indonesian properties and use pivot for the privileged patient in object voice. The terminology varies; the robust practical fact is that the patient occupies the position targeted by the construction and by relativization, while the preverbal pronominal actor is not a freely placed actor-voice subject.
Relativization as a diagnostic
Indonesian subject relatives use yang followed directly by the predicate. The gap after yang corresponds to the relativized subject.
Perempuan yang membawa map hijau itu sekretaris baru kami.
The woman carrying the green folder is our new secretary.
Anak yang sedang menunggu di teras itu keponakan Pak Darto.
The child waiting on the porch is Mr. Darto's niece or nephew.
The understood subjects of membawa and sedang menunggu are the head nouns perempuan and anak.
To relativize a patient, Indonesian normally chooses a patient-oriented voice rather than leaving a gap after an actor-voice meN- verb.
Laporan yang diperiksa kepala bagian itu belum diterbitkan.
The report checked by the division head has not been published yet.
Laporan yang saya periksa tadi pagi masih perlu direvisi.
The report I checked this morning still needs revision.
Sepeda yang dibeli Rina minggu lalu sudah rusak.
The bicycle Rina bought last week is already broken.
The relative predicates diperiksa kepala bagian, saya periksa, and dibeli Rina are compatible with a patient gap. An actor-voice version is not:
❌ Laporan yang kepala bagian memeriksa kemarin belum terbit.
Incorrect relative structure — actor-voice memeriksa cannot directly relativize its object this way.
✅ Laporan yang diperiksa kepala bagian kemarin belum terbit.
The report checked by the division head yesterday has not been published yet.
Relativization is one of the strongest diagnostics because it reveals which participant the chosen voice makes structurally accessible.
Adjective clauses have subjects too
A clause does not lose its subject because the predicate is adjectival.
Kamar paling ujung terlalu sempit untuk dua orang.
The room at the very end is too narrow for two people.
Anak-anak di kelas ini sangat aktif.
The children in this class are very active.
Jalan menuju air terjun masih licin setelah hujan.
The path to the waterfall is still slippery after rain.
The subjects are the complete noun phrases kamar paling ujung, anak-anak di kelas ini, and jalan menuju air terjun. The markers terlalu, sangat, and masih belong to their adjective predicates.
Existential clauses resist the simple template
Existential ada introduces an entity in a location or situation, often after the predicate.
Di halaman ada tiga anak yang sedang bermain layang-layang.
There are three children flying kites in the yard.
Ada pesan penting untuk Anda di meja depan.
There is an important message for you at the front desk.
The initial di halaman is not a subject; it is a locative setting. The post-ada noun phrases introduce new entities and do not have the ordinary profile of definite preverbal subjects.
Compare a definite entity already under discussion:
Tiga anak itu ada di halaman bersama kakeknya.
Those three children are in the yard with their grandfather.
Here tiga anak itu is a clear preverbal subject, and ada di halaman locates its referent.
There is a genuine analytic difficulty: grammarians differ on whether the postverbal existential noun phrase should be called a subject, pivot, associate, or complement of existential ada. For learners, two conclusions are secure. Do not call the fronted location a subject merely because English begins “there,” and do not assume every Indonesian clause must display a definite preverbal subject.
Subject omission and recovery
An established subject can be left unspoken. Its identity comes from discourse, not from the form of the verb.
A: Rani ke mana? B: Pergi ke bank sebentar.
A: Where did Rani go? B: She went to the bank for a moment. (informal)
Baru tiba di Surabaya dan langsung menuju hotel.
I or they just arrived in Surabaya and went straight to the hotel. (context-dependent)
Tolong letakkan paketnya di meja resepsionis.
Please put the package on the reception desk.
The first exchange recovers Rani. The second requires a prior speaker or topic; in isolation it is ambiguous. The imperative recovers the addressee.
Repeat the subject when reference could shift.
Setelah Sari menelepon Maya, Sari mengirim alamat lengkapnya.
After Sari called Maya, Sari sent her full address.
Even this sentence leaves the possessor expressed by -nya potentially dependent on context, but repeating Sari clearly identifies the sender.
A practical subject checklist
No single question works in every Indonesian construction. Use this sequence:
- Identify the complete predicate and its voice.
- Find the noun phrase the clause grammatically predicates about.
- Separate fronted time, place, and topic phrases from candidate subjects.
- Check whether voice makes an actor or patient structurally privileged.
- Use relativization and discourse continuity as additional evidence.
- Allow the subject to be omitted or existentially noncanonical when the construction licenses it.
Pagi ini, proposal baru itu akan dibahas oleh dewan.
This morning, the new proposal will be discussed by the council.
Pagi ini is a time setting, proposal baru itu is the passive subject, akan dibahas is the predicate, and oleh dewan expresses the semantic actor.
Common Mistakes
Calling the semantic actor subject in a passive
❌ Dalam contoh “Surat itu ditandatangani direktur”, direktur adalah subjek gramatikal.
Incorrect analysis — direktur is the passive actor, not the grammatical subject.
✅ Dalam contoh “Surat itu ditandatangani direktur”, surat itu adalah subjek gramatikal.
In surat itu ditandatangani direktur, surat itu is the grammatical subject.
Treating the first phrase as subject automatically
❌ Dalam contoh “Besok pagi kami berangkat”, besok pagi adalah subjek.
Incorrect analysis — besok pagi is a time adverbial.
✅ Dalam contoh “Besok pagi kami berangkat”, kami adalah subjek.
In besok pagi kami berangkat, kami is the subject.
Calling the object-voice actor the subject
❌ Dalam contoh “Berkas itu saya simpan”, saya adalah subjek gramatikal.
Incorrect analysis — saya is the actor inside the object-voice predicate.
✅ Dalam contoh “Berkas itu saya simpan”, berkas itu menempati posisi subjek atau pivot.
In berkas itu saya simpan, berkas itu occupies the subject or pivot position.
Requiring a verb before recognizing a subject
❌ Kalimat “Nia sangat teliti” tidak memiliki subjek karena tidak ada verba.
Incorrect analysis — a clause with an adjective predicate still has a subject.
✅ Dalam kalimat “Nia sangat teliti”, Nia adalah subjek dan sangat teliti adalah predikat.
In Nia sangat teliti, Nia is the subject and sangat teliti is the predicate.
Treating a fronted existential location as subject
❌ Dalam contoh “Di rak atas ada tiga map”, di rak atas adalah subjek.
Incorrect analysis — di rak atas is the locative setting.
✅ Dalam contoh “Di rak atas ada tiga map”, frasa di rak atas berfungsi sebagai keterangan tempat.
In di rak atas ada tiga map, di rak atas functions as a locative expression.
Key Takeaways
- Identify the predicate and voice before assigning subjecthood.
- Prepredicate position and referentiality are useful tendencies, not complete definitions.
- Actor voice commonly aligns actor and subject; di- passive and object voice privilege the patient.
- Subject relativization and patient-oriented relative voice provide strong structural diagnostics.
- Existential clauses and omitted subjects show why Indonesian cannot be forced into one English-style template.
Now practice Indonesian
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Indonesian →Related Topics
- Constituents and Phrase BoundariesB1 — Identify Indonesian noun, verb, adjective, prepositional, and adverb phrases through grouping, substitution, and prosody.
- Predicate Categories and Their SyntaxB1 — Identify verbal, nominal, adjectival, numeral, and prepositional predicates through negation, modification, and copula behavior.
- Word Order Across Actor, di-, and Object VoiceA2 — Track actor, patient, and verb order across meN- actor voice, di- passive, and patient-first object voice.
- Choosing Voice Across a Discourse: Subjects, Objects, and Argument OrderC1 — Diagnose Indonesian actors, patient pivots, objects, agents, pronouns, and omitted arguments through morphology, relativization, and topic continuity.
- Existential and Presentational SentencesA2 — Use ada to say that something exists or is present, with no dummy equivalent of English there.
- Omitting Subjects and ObjectsA2 — Omit Indonesian subjects and objects when shared context makes their referents recoverable.