Case Markers Ang, Ng, and Sa in Tagalog

In Brief

Tagalog places ang, ng, or sa before a noun phrase to show its role in the sentence. As a beginner rule, use ang for the sentence's central or focused participant, ng for a possessor or a nonfocused actor/object, and sa for a place, direction, recipient, or beneficiary. With a person's name, the corresponding forms are si, ni, and kay.

Overview

A case marker is a short word placed before a noun or noun phrase to indicate what that phrase is doing in a sentence. A noun is simply a word for a person, place, thing, or idea, such as bata “child,” Maynila “Manila,” or libro “book.” English relies heavily on word order and prepositions: compare “Maria called Juan” with “Juan called Maria.” Tagalog also uses word order, but its markers provide essential information about each participant's role.

The three basic marker sets are traditionally called the ang, ng, and sa forms. You will encounter them in your first A1 sentences, and learning them as a system is more useful than trying to translate each one as an English article or preposition. Ang can sometimes resemble “the,” ng can sometimes resemble “of,” and sa can sometimes resemble “to” or “at,” but none of those translations works in every sentence.

These markers are closely connected to Tagalog voice (the verb pattern that selects which participant is presented as central). That interaction becomes important later. At first, concentrate on recognizing the three roles and on choosing the special forms used before personal names.

How It Works

The basic marker sets

Role	Common noun phrase	One personal name	Several personal names
Central/topic form	ang	si	sina
Noncentral/genitive form	ng	ni	nina
Oblique form	sa	kay	kina

“Genitive” here means the form commonly used for a possessor and for certain noncentral participants. “Oblique” means a role such as place, destination, recipient, or beneficiary rather than the central participant selected by the verb.

The marker comes before the whole noun phrase:

• ang bata — the child (central phrase)
• ang mabait na bata — the kind child (central phrase)
• ng bagong libro — a/the new book in an ng role
• sa malaking palengke — at/to the large market
• si Maria — Maria in an ang role
• kay Ginoong Santos — to/for Mr Santos

Ang: the central participant

Ang marks the noun phrase selected as central by the sentence's predicate or verb voice. In simple descriptions, this is often the person or thing being described:

• Mabait ang guro. — “The teacher is kind.”
• Nasa mesa ang susi. — “The key is on the table.”

With an actor-voice verb, the actor—the person doing the action—normally takes ang:

• Kumakain ang bata ng mangga. — “The child is eating a mango.”
• Bumili si Ana ng tinapay. — “Ana bought bread.”

It is tempting to call every ang phrase the grammatical subject. That shortcut works in many beginner sentences, but “central participant” or “voice-selected phrase” is safer. With an object-voice verb, the affected object can take ang, while the actor takes ng:

• Kinain ng bata ang mangga. — “The child ate the mango.”

Also avoid treating ang as a direct equivalent of English “the.” It often accompanies a definite or identifiable phrase, but its grammatical job is to mark the central phrase. English definiteness and Tagalog case marking are not the same system.

Ng: possession and noncentral participants

Ng has several closely related jobs.

First, it links a possessor to what is possessed:

• libro ng bata — “the child's book” or “the book of the child”
• pangalan ng guro — “the teacher's name”

The thing possessed comes first, then ng, then the possessor. This order differs from the English possessive with 's: English “the child's book” becomes literally “book ng child.”

Second, after an actor-voice verb, ng commonly marks a noncentral object (the person or thing affected by the action):

• Bumili ako ng isda. — “I bought fish/a fish.”
• Uminom siya ng tubig. — “He/She drank water.”

Third, with object voice and several other non-actor voices, ng marks the noncentral actor:

• Binili ng babae ang isda. — “The woman bought the fish.”
• Isinulat ni Leo ang liham. — “Leo wrote the letter.”

English uses “by” for the actor in a passive sentence, but Tagalog voice is not a neat copy of the English active/passive contrast. For now, notice the dependable pairing: the verb selects the ang phrase, and another participant may appear with ng.

Sa: place, direction, recipient, and beneficiary

Sa introduces many roles that English expresses with prepositions. Common meanings include:

• location: sa bahay — “at/in the house”
• destination: sa Maynila — “to Manila”
• source in some expressions: galing sa Cebu — “from Cebu”
• recipient: sa guro — “to the teacher”
• beneficiary: para sa bata — “for the child”
• time: sa Lunes — “on Monday”

The exact English preposition depends on the expression. Do not choose between at, in, on, to, and from first and then expect a one-to-one Tagalog match. Learn useful combinations such as nasa bahay “at home,” pumunta sa opisina “go to the office,” and galing sa paaralan “coming from school.”

Before one personal name, use kay, not sa:

• Ibigay mo ito kay Rosa. — “Give this to Rosa.”
• Galing ito kay Ben. — “This came from Ben.”

Personal names: si, ni, and kay

A personal name normally takes its own marker. The marker changes according to the same three-way contrast:

Function	Common noun	Personal name	Example
Central phrase	ang	si	Dumating si Liza. — “Liza arrived.”
Possessor/noncentral actor	ng	ni	Bahay ni Liza. — “Liza's house.”
Destination/recipient/source	sa	kay	Pumunta ako kay Liza. — “I went to Liza/to Liza's place.”

For two or more named people, use sina, nina, and kina: sina Liza at Ben, bahay nina Liza at Ben, para kina Liza at Ben. These plural personal markers can also refer to a named person and that person's group. In everyday speech, sina Ana may mean “Ana and the others,” depending on context.

Personal titles and kinship terms used like names often follow the personal set: si Doktor Reyes, ni Ate, kay Tito Ramon. Usage can vary with how strongly a title is being treated as a personal designation, so learn common phrases from context.

Plural common nouns

The plural marker mga comes after the case marker and before the noun:

• ang mga bata — the children in the central role
• ng mga bata — of/by the children, or children in an ng role
• sa mga bata — to/for the children

The noun itself does not need a plural ending. The fuller plural system is covered separately in Plural Marker Mga.

Examples in Context

Tagalog	English	Note
Ang bata ay kumakain.	The child is eating.	Ang marks the central phrase in an ay sentence.
Kumakain ang bata ng mangga.	The child is eating a mango.	Actor voice: the eater takes ang.
Kumakain ang bata ng mangga.	The child is eating a mango.	The noncentral object takes ng.
Kinain ng bata ang mangga.	The child ate the mango.	Object voice: actor with ng, selected object with ang.
Libro ng bata ito.	This is the child's book.	Ng marks possession.
Uminom si Paolo ng kape.	Paolo drank coffee.	Ng introduces the thing consumed.
Pumunta siya sa palengke.	He/She went to the market.	Sa marks a destination.
Nagtatrabaho ako sa ospital.	I work at the hospital.	Sa marks a location.
Ibinigay ni Maria ang libro kay Juan.	Maria gave the book to Juan.	Personal-name forms: actor ni, recipient kay.
Binigay ni Maria kay Juan.	It was given by Maria to Juan.	Colloquial context may leave the understood item unspoken.
Si Elena ang bagong guro.	Elena is the new teacher.	Si marks one personal name as central.
Kaibigan ni Elena si Rosa.	Rosa is Elena's friend.	The possessor's name takes ni.
Para sa mga bisita ang pagkain.	The food is for the visitors.	Sa follows para; mga marks plural.
Dumating sina Carlo at Mia.	Carlo and Mia arrived.	Sina marks multiple personal names.

Common Mistakes

Using ang as if it simply meant “the”

• Wrong: Bumili ako ang tinapay.
• Right: Bumili ako ng tinapay.
• Why: In this actor-voice sentence, ako is the selected actor and the purchased item is a noncentral object. English “the/a” does not determine the Tagalog marker by itself.

Using a common-noun marker before a personal name

• Wrong: Dumating ang Maria.
• Right: Dumating si Maria.
• Why: One personal name takes si in the central form. Use ni for the corresponding possessor or noncentral actor and kay for a recipient, destination, or source.

Keeping the English possessive order

• Wrong: bata ng libro for “the child's book”
• Right: libro ng bata
• Why: Tagalog normally places the possessed item first and the possessor after ng: literally, “book of child.”

Using sa before a named recipient

• Wrong: Ibigay mo ito sa Ana.
• Right: Ibigay mo ito kay Ana.
• Why: Use kay before one personal name. Use sa before a common noun: sa babae “to the woman.”

Confusing ng with nang

• Wrong: Uminom siya nang tubig.
• Right: Uminom siya ng tubig.
• Why: Here, water is the object of drinking, so it takes the case marker ng. Nang has other jobs, including marking manner: tumakbo nang mabilis “ran quickly.”

Forgetting the marker entirely

• Wrong: Pumunta ako palengke.
• Right: Pumunta ako sa palengke.
• Why: A destination expressed by a common noun normally needs sa.

Usage Notes

In natural speech, ay is less common than predicate-first order. Both Ang bata ay kumakain and Kumakain ang bata are grammatical, but the second often sounds more conversational. This difference changes the order, not the marker's basic role; see Ay Inversion.

The written form ng is conventionally pronounced like nang (roughly /naŋ/), even though it has only two letters. Pronunciation therefore does not always tell you whether a speaker means the case marker ng or the separate word nang; grammar and context do. In informal digital writing, native speakers may use nonstandard spellings, but learners should preserve the standard distinction.

Tagalog frequently leaves information unspoken when the context makes it clear. A sentence such as Binigay ni Maria kay Juan can be understood when everyone already knows what was given. In a self-contained sentence, stating the item—Ibinigay ni Maria ang libro kay Juan—is clearer.

Names of places are generally not treated like personal names: sa Maynila, not kay Maynila. Kay is associated mainly with people or with a person understood through a name or title.

Beyond the Basics: Voice and Meaning

You do not need to master the full Tagalog voice system at A1, but you will see why “ang equals subject” and “ng equals object” eventually fail. Compare:

Actor-voice sentence	Object-voice sentence	Shared event
Bumili ang babae ng isda.	Binili ng babae ang isda.	The woman bought the fish.
Sumulat si Leo ng liham.	Isinulat ni Leo ang liham.	Leo wrote the letter.

In the actor-voice versions, the actor is the ang/si phrase. In the object-voice versions, the affected object is the ang phrase and the actor is the ng/ni phrase. The choice is not merely decorative: it reflects how the speaker organizes the event and which participant is grammatically selected and prominent in the discourse.

Definiteness also interacts with this system. An ang phrase is commonly identifiable or definite, while an ng object in an actor-voice sentence is often nonspecific or introduced as new information. Nevertheless, case and definiteness are not identical. Context, vocabulary, and voice all contribute, so do not force every ng phrase to mean “a” or every ang phrase to mean “the.”

The sa category is broad. More advanced constructions use it for goals, sources, beneficiaries, certain experiencers, and participants licensed by particular verbs. Location expressions also combine it with words such as loob “inside” and ilalim “under”: sa loob ng bahay “inside the house.” Notice the nested markers: sa introduces the location phrase, while ng links bahay to loob. See Basic Prepositions and Location for that system.

Finally, distinguish case-marker ng from two other forms that look or sound similar: the linker -ng, as in magandang bahay “beautiful house,” and nang, as in nagsalita nang tahimik “spoke quietly.” They belong to different grammatical systems even when their pronunciation overlaps.

Practice Tips

1. Learn the markers in matched triples. Make cards such as ang guro / ng guro / sa guro and si Maria / ni Maria / kay Maria. Add a short role cue rather than a single English translation.
2. Color-code complete noun phrases. In a short Tagalog text, underline every ang/si phrase in one color, every ng/ni phrase in another, and every sa/kay phrase in a third. Then identify the verb voice and ask why each participant has its marker.
3. Transform paired sentences. Start with Bumili si Ana ng libro, then compare Binili ni Ana ang libro. Keep the event the same and observe how the verb, si/ni, and ng/ang change together.

Related Concepts

• Next step: Plural Marker Mga — place mga after ang, ng, or sa to mark common nouns as plural.
• Next step: Ay Inversion — compare predicate-first order with topic-first sentences using ay.
• Next step: Basic Prepositions and Location — build location phrases with sa, nasa, loob, labas, and related words.
• Later contrast: Uses of Nang/Ng — distinguish the case marker ng from the adverbial and linking functions of nang.