A complement clause expresses a proposition that functions as the content of another predicate: what someone knows, says, believes, notices, or considers important. Filipino commonly links that proposition with na or its attached allomorphs -ng and -g. This resembles English that in some sentences, but it is part of the broader Filipino linker system and cannot be translated mechanically.
From an independent statement to embedded content
Begin with a complete statement:
Darating si Mila bago magtanghali.
Mila will arrive before noon.
The same proposition can become the content of alam “know.” Because the preceding clitic ko ends in a vowel, the linker appears as attached -ng:
Alam kong darating si Mila bago magtanghali.
I know that Mila will arrive before noon.
The embedded clause still has its own predicate (darating), aspect, and ang-marked actor (si Mila). Embedding does not turn that actor into an English-style object of alam. Voice and phrase marking remain active inside the lower clause.
Napansin naming hindi pa nabubuksan ng tagapamahala ang likurang pinto.
We noticed that the manager had not yet been able to open the rear door.
Here ang likurang pinto is the pivot of the patient-oriented ability/result form nabubuksan, while ng tagapamahala is its actor. The matrix experiencer is namin. There are two layers of participant structure, so reading from each predicate outward is safer than forcing the whole sentence into one English subject–verb–object frame.
The three surface forms
The form is determined by the sound immediately before the linker, not by the meaning of the complement.
| Preceding form | Linker | Example frame | Function |
|---|---|---|---|
| Ends in most consonants | separate na | Tiyak na darating… | Links an evaluation to its propositional content |
| Ends in a vowel | attached -ng | Alam kong darating… | ko + -ng |
| Ends in n | attached -g | Inaasahang darating… | inaasahan + -g |
Tiyak na mauunawaan ng mga mambabasa ang dahilan ng pagbabago.
It is certain that the readers will understand the reason for the change.
Naniniwala akong sapat ang ebidensiyang nakalap ng pangkat.
I believe that the evidence gathered by the team is sufficient.
Inaasahang bababa ang singil sa kuryente sa susunod na buwan.
Electricity rates are expected to fall next month.
These forms follow the same phonological distribution described on the linker na and the linker -ng. They are written according to the word they attach to: ako + -ng → akong, inaasahan + -g → inaasahang.
Content clauses after speech and thought predicates
Predicates of speech, report, perception, and belief commonly take declarative content. Both an attached linker and a separate na can occur, depending on what directly precedes the clause.
Ipinaliwanag niyang magpapatuloy ang klase kahit umuulan.
She explained that the class would continue even though it was raining.
Nagbabala ang inhinyero na maaaring gumuho ang lumang pader.
The engineer warned that the old wall might collapse.
With sinabi, speakers may choose a linker construction such as Sinabi niyang…, or retain na after an overt noun phrase: Sinabi ng inhinyero na…. The choices distribute information differently; they are not a contrast between correct and incorrect Filipino. Formal writing tends to avoid a chain of attachments if a separate na makes the clause boundary easier to process.
A direct quotation is different. It reproduces the speaker’s words rather than grammatically embedding their propositional content:
Sinabi ng punong-guro, “Mananatiling bukas ang aklatan hanggang alas-sais.”
The principal said, “The library will remain open until six.”
Sinabi ng punong-guro na mananatiling bukas ang aklatan hanggang alas-sais.
The principal said that the library would remain open until six.
Filipino does not apply English backshift mechanically. The aspect and time expression inside the complement reflect how the event is viewed; mananatili remains contemplated because the continued opening is prospective relative to the relevant speech situation.
Declarative na versus interrogative kung
An embedded yes–no question normally uses kung, not declarative na. Compare knowing a fact with not knowing whether it is true:
Alam kong bukas ang tanggapan sa Sabado.
I know that the office is open on Saturday.
Hindi ko alam kung bukas ang tanggapan sa Sabado.
I do not know whether the office is open on Saturday.
Question-word complements retain their question word: Tinanong niya kung kailan…, Hindi malinaw kung bakit…. See embedded questions with kung for clause-type distinctions.
Naitanong mo ba kung sino ang mangangasiwa sa pagpupulong?
Were you able to ask who will oversee the meeting?
The enclitic ba belongs to the matrix question. Kung sino… marks the content being asked about; it does not make the entire utterance a direct question by itself.
Na is not always a complement linker
The same spelling na can be the aspectual particle “already/now,” while nang has separate adverbial and clause-linking functions. Context and placement matter.
Alam ko na ang sagot.
I know the answer now.
Alam ko nang handa na ang lahat.
I now know that everything is ready.
In the second example, nang represents na “now/already” plus attached linker -ng before the content clause. That surface sequence is not the same as simply misspelling the complement linker. This overlap is genuinely difficult; learners must analyze what each element contributes rather than replacing every English that with na.
Coreference, omission, and voice
Complement clauses may state their own participant overtly, as in darating si Mila, or leave a participant recoverable. When the matrix predicate selects the understood actor of the lower event, the result approaches a control construction, treated on Verb Complements and Control. Not every omitted pronoun is syntactic control; Filipino independently permits contextually recoverable arguments.
—Tuloy ba ang pagdinig bukas? —Oo. Kinumpirma ng kalihim na dadalo ang lahat ng saksi.
—Is the hearing going ahead tomorrow? —Yes. The secretary confirmed that all the witnesses will attend.
The lower actor is overt because it supplies new information. If the witnesses were already the topic, Filipino could omit them, but formal prose often retains a noun phrase when omission would create competing possible referents.
Common Mistakes
Translating English that as iyon
❌ Alam ko iyon darating si Mila.
Incorrect—the demonstrative iyon cannot serve as an English-style complementizer.
✅ Alam kong darating si Mila.
I know that Mila will arrive.
Iyon can be a pronoun meaning “that,” but the linking function here is -ng attached to ko.
Omitting a required linker
❌ Tiyak darating ang tagasuri ngayong hapon.
Incorrect in standard Filipino—the evaluative predicate and its content lack a linker.
✅ Tiyak na darating ang tagasuri ngayong hapon.
The inspector will certainly arrive this afternoon.
Using na for an embedded yes–no question
❌ Tinanong niya na natanggap ko ang liham.
Incorrect for 'She asked whether I received the letter'—na presents declarative content.
✅ Tinanong niya kung natanggap ko ang liham.
She asked whether I received the letter.
Copying English subject-first order inside the complement
❌ Ipinaliwanag ng tagapayo na ang pagsasanay magpapatuloy kahit umuulan.
Incorrect in neutral standard order—the initial ang phrase is not licensed as a topic.
✅ Ipinaliwanag ng tagapayo na magpapatuloy ang pagsasanay kahit umuulan.
The adviser explained that the training would continue even though it was raining.
The correction restores predicate-first order inside the embedded clause. If ang klase is deliberately topicalized, ang klase ay magpapatuloy is possible, but it carries marked topic-comment organization rather than neutral order.
Key Takeaways
Declarative complement clauses are linked by na, attached -ng, or attached -g according to phonological context. The embedded clause retains its own predicate, aspect, voice, and participant marking. Use kung for embedded polar questions, distinguish the linker from aspectual na and adverbial nang, and do not import English complementizers or word order into the lower clause.
Related Topics
- The Linker naA2 — Use separate na after most consonant-final words to build modifiers, counted expressions, and phrase-internal descriptions.
- The Linker -ngA2 — Attach -ng after vowel-final words to connect modifiers, nouns, numbers, pronouns, and selected complements.
- Verb Complements and ControlC1 — Understand how Filipino matrix predicates select event complements and how an unspoken embedded participant is identified from the larger clause.
- Embedded Questions with kungC1 — Embed yes–no, alternative, and question-word content with kung while keeping matrix question force and lower-clause voice distinct.
- Reported Speech with sabiC1 — Report statements, quotations, questions, and instructions with sabi and sinabi while preserving Filipino aspect, voice, and source marking.
- Relative Clauses: OverviewB2 — Learn how Filipino relative clauses use linkers and voice to identify a head noun without English relative pronouns.