The completed form of an -um- actor-voice verb presents an event as a bounded whole. With a consonant-initial root, insert -um- before its first vowel; with a vowel-initial root, place um- at the beginning. The resulting form still selects the actor as pivot.
Completed aspect frequently describes past events, but it is not an English past tense. Context places the event in time, while the Filipino verb presents it as complete relative to the relevant viewpoint.
For the broader contrast with incompleted and contemplated events, review the introduction to verb aspect. Here the focus is the morphology and interpretation of one affix family.
Building the completed form
The basic/infinitive and completed cells of an -um- family normally have the same surface form. That identity is real; Filipino does not add another ending when the basic form becomes completed in a statement.
| Root | Root shape | Formation | Basic/completed surface form |
|---|---|---|---|
| kain | consonant-initial | k + um + ain | kumain |
| bili | consonant-initial | b + um + ili | bumili |
| sulat | consonant-initial | s + um + ulat | sumulat |
| takbo | consonant-initial | t + um + akbo | tumakbo |
| alis | vowel-initial | um + alis | umalis |
| akyat | vowel-initial | um + akyat | umakyat |
| uwi | vowel-initial | um + uwi | umuwi |
The segmented forms explain the morphology only. Ordinary text uses kumain, bumili, sumulat, tumakbo, umalis, umakyat, and umuwi without hyphens.
Umuwi si Pilar bago lumakas ang ulan.
Pilar went home before the rain became heavy.
Tumakbo ang nars papunta sa silid nang marinig niya ang alarma.
The nurse ran toward the room when she heard the alarm.
In the second example, nang introduces the event that set the running in motion. It is not the non-pivot marker ng. Both verbs present the movement as a whole, and si Pilar/ang nars are actor pivots.
Completed means bounded, not simply past
A completed event can be recent or remote, and it can remain relevant to a present result. Adverbs, particles, and neighboring clauses establish the timeline.
Kumain na si Lolo bago dumating ang mga apo.
Grandfather had already eaten before the grandchildren arrived.
Noong isang taon, sumulat si Amina sa tanggapan tungkol sa sirang tulay.
Last year, Amina wrote to the office about the damaged bridge.
Kumain na ang mga bata, kaya puwede na nating ligpitin ang mesa.
The children have already eaten, so we can clear the table now.
The last sentence has a present result: the meal is complete, so the table can now be cleared. English naturally uses a present perfect, showing why “completed = simple past” is inadequate.
The particle na often adds “already” or signals a new state, but it does not create completed aspect. Sumulat is completed even without na; na merely sharpens the phase relation.
The same form can be basic or completed
Compare two uses of bumili:
Bumili ka muna ng yelo bago pumunta sa handaan.
Buy some ice first before going to the gathering.
Bumili si Kaye ng yelo bago pumunta sa handaan.
Kaye bought some ice before going to the gathering.
The first bumili is a positive command and therefore a basic form. The second is completed because it heads a statement about a bounded event. The spelling alone does not choose between the two cells; clause type, participants, particles, and context do.
This syncretism is a genuine difficulty for English speakers accustomed to distinct buy and bought. It is not an omission in Filipino morphology.
Voice and participant structure remain visible
Completed -um- is actor voice. A common-noun actor pivot takes ang, a singular name takes si, and a core patient commonly takes ng.
Bumili si Celso ng tatlong ilaw para sa pasilyo.
Celso bought three lights for the hallway.
The actor si Celso is pivot. Ng tatlong ilaw is the thing bought, and para sa pasilyo is a beneficiary/purpose phrase. Numeral tatlong uses linker -ng after vowel-final tatlo; this attached linker differs from the separate marker ng.
Compare the same root in actor and patient voice:
Bumili si Celso ng ilaw na nasa estante.
Celso bought a light that was on the shelf.
Binili ni Celso ang ilaw na nasa estante.
Celso bought the light that was on the shelf.
Both verbs are completed, but bumili makes the buyer pivot and binili makes the light pivot. Definiteness does not itself determine the voice: the relative clause can identify the light even while it remains a ng phrase in actor voice.
Negation and questions
Hindi can negate a completed event without changing its aspect form. A yes–no question adds ba in the early enclitic cluster.
Hindi sumama si Ramon sa lakad dahil masama ang pakiramdam niya.
Ramon did not join the outing because he felt unwell.
—Umakyat ba si Mina sa entablado? —Oo, umakyat siya para tanggapin ang parangal.
—Did Mina go up onstage? —Yes, she went up to accept the award.
The negative says that the bounded joining event did not occur. In the exchange, repeated umakyat is completed in both question and answer; ba marks the question, while oo supplies confirmation.
Lexical families and accepted alternatives
Formation is predictable only after a root is known to belong to an -um- family. A root is a family of constructions, and one citation form hides its derivational system. The completed form of kain is kumain, but the ordinary actor-voice completed form of luto is nagluto, not lumuto.
Some roots occur in more than one contemporary actor-voice family. Bumiyahe and nagbiyahe are both heard for completed travel events, with speaker and collocational preferences. That accepted variation does not erase the morphological distinction: each form belongs to its own paradigm, and other roots may permit only one ordinary family or may change meaning when the affix changes.
Common Mistakes
Adding an English past-tense ending
❌ Sumulat-ed si Miko sa tagapamahala noong Lunes.
Incorrect — completed sumulat does not take the English ending -ed.
✅ Sumulat si Miko sa tagapamahala noong Lunes.
Miko wrote to the manager on Monday.
The time phrase places the event in the past; the Filipino verb already presents it as completed.
Putting -um- after the first vowel
❌ Bi-um-ili si Mara ng baterya para sa orasan.
Incorrect analysis and spelling — -um- precedes the first vowel of bili, producing bumili as one word.
✅ Bumili si Mara ng baterya para sa orasan.
Mara bought a battery for the clock.
Teaching segmentation must not be copied into ordinary orthography.
Using a completed form merely because the setting is past
❌ Kumain kami nang tumawag ka kagabi.
Wrong for 'We were eating when you called last night' — kumain presents the meal as a bounded whole.
✅ Kumakain kami nang tumawag ka kagabi.
We were eating when you called last night.
The past setting comes from kagabi and nang tumawag ka. Incompleted kumakain supplies the background event view; past time alone does not require completed aspect.
Switching only the patient marker
❌ Bumili si Celso ang ilaw na nakasabit sa pasilyo.
Incorrect — actor-voice bumili cannot simply take an ang-marked patient pivot.
✅ Binili ni Celso ang ilaw na nakasabit sa pasilyo.
Celso bought the light that was hanging in the hallway.
The correction changes both the verb and actor marker because voice is a construction-wide alignment.
Key Takeaways
- Insert -um- before the first vowel of a consonant-initial root; prefix um- to a vowel-initial root.
- The basic and completed forms are normally identical in this family.
- Completed aspect presents a bounded event; context, not the form alone, supplies past or future time.
- Completed -um- remains actor voice and requires actor-voice participant marking.
- Apply the pattern only to roots with an attested -um- family.
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Start learning Filipino →Related Topics
- The -um- actor voice: Function and DistributionB1 — Learn where -um- appears, how it marks actor voice, and why its distribution must be learned with each Filipino root.
- The -um- actor voice: Incompleted-Aspect FormationB1 — Build incompleted -um- actor-voice forms for ongoing, habitual, repeated, and backgrounded events.
- The -um- actor voice: Contemplated-Aspect FormationB1 — Form contemplated -um- actor-voice verbs and use them for events viewed as not yet begun.
- Infinitive and Contemplated FormsA2 — Distinguish aspect-neutral infinitive or basic verb forms from contemplated forms that present an event as not yet begun.
- Completed versus Incompleted AspectB1 — Choose completed aspect for events viewed as bounded wholes and incompleted aspect for unfolding, recurring, or internally viewed events.
- Marker Choice with Actor-Voice VerbsA1 — Choose ang, ng, and sa phrases with actor-voice verbs by identifying the actor pivot, core patient, and oblique participants.