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A1 particle 15 min read

Si

Examples
Explanation Si in your Level:
At the absolute beginner level (CEFR A1), the word 'si' is one of the very first vocabulary items and grammar rules you must learn in the Filipino language. It is a fundamental building block for forming the most basic sentences. At this stage, your primary goal is to learn how to identify people, state their names, and describe simple actions they are doing. In English, you can just say a person's name directly. For example, 'Maria is happy' or 'John is eating'. However, in Filipino, you cannot leave a name 'naked' in a sentence. You must put a marker in front of it to tell the listener what role that name plays. The marker 'si' acts as a flag that says, 'Here comes a person's name, and this person is the main subject of our sentence.' Therefore, 'Maria is happy' becomes 'Masaya si Maria'. Notice how the describing word (Masaya) comes first, followed by 'si', and then the name. This Verb/Adjective-Subject order is standard in Filipino. You will use 'si' constantly when introducing your friends, talking about your family, or describing characters in a simple story. For example, if you want to say your brother is tall, and his name is Pedro, you say 'Matangkad si Pedro'. If you want to say that Ana is running, you say 'Tumatakbo si Ana'. It is crucial at this A1 level to build the physical habit of never saying a name as a subject without attaching 'si' to it. It might feel repetitive or unnecessary to an English speaker, but it is deeply ingrained in the rhythm of Tagalog. Furthermore, you will learn to use 'si' with family titles, which are treated like names in Filipino culture. 'Nanay' (Mother) and 'Tatay' (Father) take 'si', not 'ang'. So, 'Nagluluto si Nanay' (Mother is cooking). By mastering the simple placement of 'si' before a single name or family title, you successfully lay the groundwork for all future, more complex sentence structures in the language. Do not worry yet about the plural 'sina' or the complex object-focus markers; just focus entirely on cementing the pattern of [Action/Description] + [si] + [Name].
As you progress to the elementary level (CEFR A2), your ability to construct sentences in Filipino expands beyond simple descriptions to more active, dynamic storytelling. At this stage, your understanding of the 'si' marker must deepen. You are no longer just saying 'Mabait si Maria' (Maria is kind); you are now linking verbs in different tenses to specific actors. You will begin to heavily utilize the actor-focus verbs (verbs that use -um-, mag-, ma- affixes). In all of these actor-focus sentences, the person doing the action is the subject, and therefore, their name must be preceded by 'si'. For instance, 'Bumili si Juan ng tinapay' (Juan bought bread), 'Naglalaro si Ana sa parke' (Ana is playing in the park), or 'Matutulog na si Pedro' (Pedro will sleep now). Notice how 'si' reliably connects the action to the specific individual. At the A2 level, you also need to start recognizing the inversion marker 'ay'. While the standard Filipino sentence puts the verb first, you can flip it to sound more like English (Subject-Verb-Object). When you do this, 'si' moves to the front with the name: 'Si Juan ay bumili ng tinapay'. It is vital to remember that even when the sentence order changes, the 'si' marker remains permanently glued to the front of the proper noun. Additionally, this is the level where you must firmly distinguish 'si' from 'ang'. You will practice sentences that contain both a proper noun subject and a common noun object. In 'Uminom si Maria ng tubig' (Maria drank water), you use 'si' for Maria because she is a specific person and the actor, but you use 'ng' (or 'ang' depending on focus) for the water because it is a common thing. You will also start encountering the plural form 'sina'. When talking about two friends, you graduate from saying 'si Juan at si Pedro' to the more natural 'sina Juan at Pedro'. The A2 level is all about building confidence in these foundational rules, ensuring that the 'si' marker becomes a subconscious reflex whenever a specific person is the star of your sentence.
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Reaching the intermediate level (CEFR B1) marks a significant shift in your Filipino language journey. You are now moving away from simple, isolated sentences and entering the realm of complex narratives, paragraph building, and conversational fluency. Your grasp of the 'si' marker must now withstand the pressures of the Filipino focus system, which is notoriously tricky for English speakers. At B1, you are heavily introduced to object-focus verbs (verbs with -in, i-, -an affixes). This is where the true test of your 'si' knowledge occurs. You must learn when to stop using 'si'. In an object-focus sentence, the actor is no longer the subject/topic; the object is. Therefore, the actor marker changes from 'si' to 'ni'. If you want to say 'The apple was eaten by Juan', you say 'Kinain ni Juan ang mansanas'. If you mistakenly say 'Kinain si Juan', you are saying Juan was eaten! At this level, you must develop the cognitive agility to instantly switch between 'si' (for actor-focus subjects) and 'ni' (for object-focus actors). Furthermore, you will begin using 'si' in more complex clauses and conjunctions. You will construct sentences like 'Dahil umuulan, hindi nakapunta si Maria sa eskwelahan' (Because it is raining, Maria was not able to go to school). You will also use 'si' with formal titles attached to names, such as 'Nagsalita si Mayor Cruz sa harap ng mga tao' (Mayor Cruz spoke in front of the people). At B1, you are also expected to confidently handle relational conversations, gossiping, and storytelling, which are heavily reliant on proper noun markers. You will hear and use phrases like 'Sabi ni Ana, pupunta daw si Pedro' (Ana said that Pedro is reportedly going). Notice the mix of 'ni' (the source of the saying) and 'si' (the subject of the going). Mastery at the B1 level means you no longer think about 'si' as just a translation of 'the'; you understand it structurally as the primary indicator of the sentence's topic when that topic happens to be a human being.
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At the upper-intermediate level (CEFR B2), your command of the Filipino language is becoming nuanced, formal, and highly adaptable. You can read news articles, watch films without subtitles, and engage in debates. The use of 'si' at this level is less about learning new rules and more about flawless execution in complex, high-speed, and formal environments. You will encounter 'si' extensively in journalistic and academic texts. News reports frequently use inverted structures or complex introductory clauses where 'si' must be placed perfectly. For example: 'Ayon sa pinakahuling ulat ng pulisya, si Juan dela Cruz, na pangunahing suspek, ay nahuli na.' (According to the latest police report, Juan dela Cruz, the primary suspect, has been caught). You must be able to track the 'si' marker across long sentences with multiple clauses and appositives. Furthermore, at the B2 level, you deeply understand the sociolinguistic aspects of the marker. You know exactly which titles require 'si' (e.g., Si Kapitan, Si Pangulong, Si Doktor) and how dropping it or replacing it alters the tone. You also understand regional and colloquial variations, such as when native speakers rapidly contract words, yet the 'si' remains distinct. You will practice using 'si' in hypothetical and conditional statements: 'Kung nandito lang sana si Maria, hindi tayo magkakaproblema' (If only Maria were here, we wouldn't have a problem). Your ability to use the directional markers (kay/kina) and possessive markers (ni/nina) in contrast with 'si/sina' is now automatic. You can comfortably express complex relational dynamics: 'Ibinigay ni Pedro ang regalo kay Ana para ibigay niya ito kay Juan, dahil si Juan ang may kaarawan.' (Pedro gave the gift to Ana for her to give it to Juan, because Juan is the one having a birthday). Notice the intricate dance of markers here. A B2 learner navigates this dance without stepping on their partner's toes, maintaining absolute grammatical precision regarding who is the focus, who is the actor, and who is the receiver.
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The advanced level (CEFR C1) in Filipino implies a near-native fluency where you can express abstract ideas, analyze literature, and converse seamlessly on any topic. At this stage, the grammatical mechanics of 'si' are entirely subconscious. Your focus shifts to the stylistic, literary, and rhetorical applications of the marker. You will encounter 'si' in classic Tagalog literature, poetry (tula), and historical documents where sentence structures can be archaic or highly poetic. In poetry, authors might employ unusual syntax for the sake of meter and rhyme, yet the rules governing 'si' remain a constant anchor. You might see sentences where the subject is delayed until the very end for dramatic effect: 'Sa gitna ng dilim at takot, lumitaw, na parang isang anghel, si Maria.' (In the midst of darkness and fear, appeared, like an angel, Maria). At the C1 level, you also master the subtle nuances of emphasis. You understand how using the 'ay' inversion ('Si Juan ay...') creates a different rhetorical weight compared to the standard predicate-initial structure ('Tumakbo si Juan'). You can use these structures deliberately to control the flow of information in a speech or an essay. Furthermore, you are fully adept at using 'si' in complex idiomatic expressions and cultural references. You understand when a common noun has been elevated to a proper noun status through personification, thus requiring 'si'. For example, in fables, animals are given the 'si' marker: 'Nag-usap si Pagong at si Matsing' (Turtle and Monkey talked). You also recognize the rare instances in highly colloquial slang where the marker might be slurred or blended with preceding words, though you know better than to replicate this in writing. A C1 user doesn't just know how to use 'si'; they know how the presence of 'si' shapes the cognitive framework of the Filipino sentence, dictating the focus and guiding the listener's attention with absolute precision.
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At the mastery level (CEFR C2), your proficiency in Filipino is equivalent to that of a highly educated native speaker. You possess a metalinguistic awareness of the language, meaning you can not only use it flawlessly but also analyze its structure, history, and evolution. Your understanding of 'si' encompasses its etymological roots in the broader Austronesian language family, comparing it to similar personal markers in languages like Cebuano, Ilocano, or even distant relatives like Indonesian or Malagasy. You understand that 'si' is a manifestation of the Philippine alignment system (often debated as a symmetrical voice or ergative-absolutive system), where 'si' marks the absolutive argument when it is a proper personal noun. You can engage in academic discourse regarding why Tagalog requires this marker while English does not, discussing concepts of noun phrase marking and definiteness. At the C2 level, you can effortlessly navigate the most complex, convoluted sentences in legal, philosophical, or historical texts where multiple actors, subjects, and beneficiaries interact. You can parse sentences like: 'Pinatunayan ng mga dokumentong isinumite ni Atty. Reyes na si Don Anastacio, sa kabila ng mga paratang, ay walang kinalaman sa anomalya.' You recognize the precise legal weight carried by the 'si' marker in identifying the exact subject of the exoneration. Furthermore, you are sensitive to the absolute subtlest shifts in register. You know how the use of 'si' versus 'ang' can sometimes be manipulated for rhetorical effect, such as dehumanizing an opponent by using 'ang' instead of 'si' (though highly irregular and aggressive). You can write compelling prose, poetry, and persuasive essays, utilizing the 'si' marker not just as a grammatical necessity, but as a tool for pacing, rhythm, and focus. At C2, 'si' is not a rule you follow; it is a fundamental element of the linguistic architecture that you command with absolute authority.
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Examples
The Filipino word 'si' is an essential grammatical particle that functions as a personal proper noun marker. In the rich tapestry of Austronesian syntax, specifically within the Tagalog language which forms the basis of modern Filipino, nouns cannot simply stand alone in a sentence without a marker indicating their grammatical role. While English speakers are accustomed to using names directly as subjects—for example, saying 'Maria is beautiful'—Filipino requires a marker to introduce the name. You cannot simply say 'Maganda Maria'; instead, you must say 'Maganda si Maria'. This particle does not have a direct, one-to-one translation in the English language, though it is sometimes loosely compared to the definite article 'the', but specifically and exclusively reserved for personal names, nicknames, and sometimes the names of beloved pets when they are treated with human-like endearment. Understanding the function of 'si' is the gateway to mastering the unique focus system of Philippine languages. When people use it, they are establishing the subject or the topic of the conversation. In a standard verb-initial Tagalog sentence, the verb comes first, followed immediately by the subject marker and the name.

Tumakbo si Juan nang mabilis patungo sa palengke.

In this example, 'Tumakbo' is the verb meaning 'ran', and 'Juan' is the person who ran. The marker 'si' bridges the action to the actor. Without it, the sentence collapses grammatically. Furthermore, 'si' is strictly singular. If you are talking about Juan and his friends, or Juan and Maria, the marker changes.
Singular Focus
Use 'si' when referring to exactly one specific person by their given name, nickname, or specific title followed by their name.
Plural Focus
Use 'sina' when referring to two or more people, or a person and their unnamed companions (e.g., 'Sina Maria' means 'Maria and her group').
It is also important to note when NOT to use 'si'. You do not use 'si' for common nouns. You would never say 'si aso' (the dog) or 'si guro' (the teacher) unless 'Aso' or 'Guro' are literal names you have given to someone. For common nouns, the marker 'ang' is used.

Nagluluto si Nanay ng masarap na adobo para sa hapunan.

Wait, 'Nanay' means mother, which is a common noun, right? Yes, but in Filipino culture, family titles like Nanay (Mother), Tatay (Father), Kuya (Older Brother), and Ate (Older Sister) are treated as proper names. Therefore, they take the personal marker 'si' instead of 'ang'. This reflects the deep cultural respect and intimacy embedded in the language.
Family Titles
Words for family members are capitalized and treated as names when used to address or refer to one's own family, thus requiring the personal marker.

Umiyak si Bantay dahil wala siyang pagkain.

Here, 'Bantay' is a common dog's name in the Philippines. Because the dog is named, it gets the 'si' marker.

Nakatira si Pedro sa kabilang kanto ng aming barangay.

Matalino si Dr. Jose Rizal, ang ating pambansang bayani.

In formal contexts, professional titles such as Doctor, Attorney, President, or Mayor are attached directly to the name, and the entire phrase is preceded by 'si'. This demonstrates that the marker encompasses the entirety of the proper noun phrase. The marker 'si' is arguably one of the most frequently spoken words in the entire archipelago. Whether in a bustling market in Manila, a formal news broadcast, or a whispered piece of gossip between neighbors, 'si' is the anchor that tells everyone exactly who is being talked about. It is simple, ubiquitous, and absolutely indispensable for anyone looking to achieve fluency or even basic conversational ability in the Filipino language.
Constructing sentences with the marker 'si' requires an understanding of Filipino sentence structure, which is predominantly predicate-initial. This means that the most important information, usually the verb or the adjective, comes first, followed by the subject. This is the exact opposite of the standard English Subject-Verb-Object (SVO) order. When you want to say that a specific person is doing an action, you place the verb first, then the marker 'si', and then the person's name.

Kumakain si Ana ng mangga sa labas ng bahay.

In this sentence, 'Kumakain' (is eating) is the predicate, and 'Ana' is the subject. The 'si' perfectly glues them together. If you want to use an adjective instead of a verb, the structure remains exactly the same.
Adjective Predicates
Place the describing word first, followed by 'si', followed by the name. For example: 'Mabait si Carlos' (Carlos is kind).
Noun Predicates
You can also identify a person's profession or role. 'Guro si Maria' translates to 'Maria is a teacher'.
However, Filipino is a highly flexible language, and there is a way to construct sentences that mirror the English Subject-Verb-Object order. This is done using the inversion marker 'ay'. When you use 'ay', the subject moves to the front of the sentence. Even in this inverted structure, the marker 'si' must remain firmly attached to the name.

Si Pedro ay nag-aaral ng wikang Tagalog araw-araw.

Notice that it is 'Si Pedro ay...', never just 'Pedro ay...'. The marker is non-negotiable. Another crucial aspect of using 'si' is understanding how it interacts with different verb focuses. Filipino verbs change their affixes depending on what part of the sentence is the focus. If the sentence is actor-focused (the person is doing the action), you use 'si' for the actor.

Bumili si Nena ng bagong sapatos sa mall.

In this actor-focus sentence ('Bumili' uses the -um- affix), Nena is the one buying, so she gets the 'si' marker. But what if the sentence is object-focused? What if we want to say 'The shoes were bought by Nena'? In object-focus sentences, the actor is no longer the main topic. Therefore, the actor marker changes from 'si' to 'ni'. The object becomes the topic and gets the 'ang' marker.

Binili ni Nena ang sapatos.

Notice that 'si' disappeared entirely! This is a massive stumbling block for English speakers. You must only use 'si' when the person's name is the absolute focus or topic of the sentence. If the person is just the doer of an action in a sentence focused on the object, you must use 'ni'.
The 'Si' vs 'Ni' Rule
Use 'si' for the subject/topic. Use 'ni' for the actor in a passive/object-focus sentence, or to show possession (e.g., 'Ang aso ni Juan' - The dog of Juan).

Aalis si Lolo bukas ng umaga papuntang probinsya.

Here, 'Lolo' (Grandfather) is treated as a proper noun and is the actor of an actor-focus verb ('Aalis' - will leave). Mastering the placement and conditions for using 'si' will immediately make your spoken and written Filipino sound profoundly more natural and grammatically sound.
You will hear the word 'si' absolutely everywhere in the Philippines, across all social strata, all media platforms, and all levels of formality. Because it is a foundational grammatical particle, it is impossible to speak the language functionally without it. In everyday street conversations, 'si' is the engine of storytelling and gossip. The Filipino culture is highly relational and community-oriented, meaning people talk about other people constantly. When neighbors share news over the fence, the sentences are heavily laden with this marker.

Alam mo ba, umuwi na daw si Marites galing Dubai!

In this context, 'si' introduces the subject of the rumor. In the workplace, 'si' is used to refer to colleagues, bosses, and clients. Even when speaking Taglish (a heavily mixed code of Tagalog and English), the grammatical scaffolding remains Tagalog, meaning English names and titles still require the marker.
Corporate Taglish
It is extremely common to hear sentences like 'Nag-email na ba si Sir John?' or 'Absent ngayon si HR Manager.'

Magmi-meeting mamaya si Boss kasama ang mga kliyente.

In this corporate example, 'Boss' is treated as a proper noun/title, thus taking the 'si' marker. In the realm of news and journalism, 'si' maintains its critical role but is often attached to formal titles. News anchors reading headlines will consistently use it to introduce political figures, celebrities, and persons of interest.
Journalistic Use
News reports require precise subject identification. You will hear phrases like 'Ayon sa ulat, si Pangulong...' (According to the report, President...).

Nagsalita na si Mayor tungkol sa bagong patakaran ng lungsod.

Furthermore, in the vibrant landscape of Philippine entertainment, particularly in teleseryes (soap operas) and movies, the dramatic tension often revolves around characters whose names are constantly invoked. 'Mahal ko si Eduardo!' (I love Eduardo!) or 'Sino ba si Antonietta?!' (Who is Antonietta?!). You will also hear it in historical contexts and educational settings. When teachers discuss history, they use 'si' to talk about heroes and villains alike.

Pinatay si Magellan ni Lapu-Lapu sa labanan sa Mactan.

Notice how 'Magellan' takes 'si' because he is the focus (the one who was killed), while 'Lapu-Lapu' takes 'ni' because he is the actor in an object-focus sentence. Finally, in religious contexts, 'si' is used to refer to divine figures when their names or specific titles are used.

Namatay si Hesus sa krus para sa ating mga kasalanan.

In summary, there is no domain of Filipino life—from the sacred to the profane, from the boardroom to the basketball court—where the word 'si' is not fundamentally active and necessary.
Because English does not have a direct equivalent for personal noun markers, native English speakers learning Filipino frequently make a distinct set of errors when trying to use, or failing to use, the word 'si'. The most glaring and common mistake is absolute omission. A learner might try to translate 'John is eating' word-for-word and say 'Kumakain John.' To a Filipino ear, this sounds incredibly broken, almost like a machine malfunctioning. The marker is the glue; without it, the sentence falls apart.

Mali: Tumakbo Maria.
Tama: Tumakbo si Maria.

The Omission Error
Never drop the marker before a person's name, even if you are speaking quickly or informally. It is a mandatory grammatical component.
The second most common mistake is confusing 'si' with 'ang'. Learners learn early on that 'ang' means 'the', and 'si' is a marker for names. But sometimes, they over-apply 'ang'. They might say 'Ang Maria ay maganda.' This is grammatically incorrect. 'Ang' is strictly for common nouns (like 'ang babae' - the woman), while 'si' is strictly for proper personal nouns.

Mali: Mabait ang Pedro.
Tama: Mabait si Pedro.

The 'Ang' Confusion
Reserve 'ang' for things, places, animals, and common nouns. Reserve 'si' for specific people's names and family titles.
A third significant error occurs when dealing with plural subjects. 'Si' is exclusively singular. If a learner wants to say 'John and Mary arrived', they might mistakenly say 'Dumating si John at Mary' or 'Dumating si John at si Mary'. While the latter is technically understandable and sometimes used in very casual speech, the grammatically correct and far more natural way to express a plural personal subject is to use the plural marker 'sina'.

Mali: Aalis si Juan at si Maria.
Mas Tama: Aalis sina Juan at Maria.

Fourth, learners often fail to switch from 'si' to 'ni' in object-focus sentences. Because English primarily relies on active voice (actor-focus), learners default to actor-focus structures in Tagalog. When they attempt passive voice (object-focus), they incorrectly retain the 'si' marker for the actor.

Mali: Kinain si Juan ang mansanas. (This means Juan was eaten!)
Tama: Kinain ni Juan ang mansanas. (The apple was eaten by Juan.)

This is a critical error because it completely reverses the meaning of the sentence. In the incorrect example above, 'si' marks Juan as the topic of 'Kinain' (was eaten), turning a simple snack into a horrific event. Finally, a minor but notable mistake for Spanish speakers or those familiar with Spanish: confusing the Tagalog 'si' with the Spanish 'sí' (meaning 'yes'). While the Philippines was a Spanish colony and absorbed thousands of Spanish loanwords, the affirmative 'yes' in Tagalog is 'oo'. The particle 'si' has absolutely nothing to do with affirmation.
False Friend Warning
If someone asks you a question in Tagalog, never answer with 'Si'. Answer with 'Oo' (Yes) or 'Hindi' (No).
By being mindful of these common pitfalls—omission, 'ang' substitution, singular/plural confusion, focus mismatch, and false friends—a learner can rapidly improve the accuracy and natural flow of their Filipino.
While 'si' is highly specific in its function as a singular personal proper noun subject marker, it belongs to a broader family of markers in Filipino grammar. Understanding 'si' is impossible without also understanding its siblings and cousins in the language. Let us break down the similar words and alternatives that form the complete matrix of Filipino noun markers.
Sina (The Plural Equivalent)
When you need to mark more than one person as the subject, 'si' transforms into 'sina'. For example, 'Naglalaro sina Pedro at Juan' (Pedro and Juan are playing). It can also mean a person and their unnamed group: 'Nandito na sina Maria' (Maria and her companions are here).

Masayang nag-uusap sina Lolo at Lola sa balkonahe.

Another crucial set of alternatives are the non-subject personal markers: 'ni' and 'nina'. As discussed in previous sections, 'si' is only used when the person is the absolute grammatical focus of the sentence. If the person is the actor in an object-focused sentence, or if you are indicating possession (showing that something belongs to someone), you must use 'ni' (singular) or 'nina' (plural).
Ni / Nina (Possessive and Actor Markers)
Use 'ni' to show ownership: 'Ang kotse ni Carlos' (The car of Carlos). Use it for the non-focused actor: 'Binasa ni Ana ang libro' (The book was read by Ana).

Nawawala ang paboritong laruan ni Bunso.

Moving further outward in the marker matrix, we have the directional or benefactive personal markers: 'kay' and 'kina'. These are used when the person is the receiver of an action, the destination of a movement, or the beneficiary of a deed. In English, these often translate to 'to', 'for', 'with', or 'from' a person.
Kay / Kina (Directional Markers)
Use 'kay' for one person: 'Ibigay mo ito kay Jose' (Give this to Jose). Use 'kina' for multiple people: 'Pumunta kami kina Tita' (We went to Tita's place/group).

Sumulat ako ng liham kay Pangulong Marcos.

Finally, we must contrast 'si' with the common noun markers: 'ang', 'ng', and 'sa'. These perform the exact same grammatical functions as the personal markers, but they are used exclusively for things, places, ideas, animals (without names), and general categories of people (like 'the doctor', 'the boy').

Tumatahol ang aso. (The dog is barking - common noun)
Tumatahol si Bantay. (Bantay is barking - proper noun)

Kinuha ng bata ang bola. (The child took the ball - common noun actor)
Kinuha ni Pedro ang bola. (Pedro took the ball - proper noun actor)

By mastering this entire ecosystem of markers—si/sina, ni/nina, kay/kina, alongside ang/ng/sa—you unlock the core mechanics of Filipino sentence structure. 'Si' is merely the most visible and frequently used member of this vital grammatical family.
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Examples by Level

1

Mabait si Ana.

Ana is kind.

Adjective (Mabait) + si + Name (Ana).

2

Kumakain si Juan.

Juan is eating.

Verb (Kumakain) + si + Name (Juan).

3

Naglalaro si Pedro.

Pedro is playing.

Verb (Naglalaro) + si + Name (Pedro).

4

Maganda si Maria.

Maria is beautiful.

Adjective (Maganda) + si + Name (Maria).

5

Tumakbo si Jose.

Jose ran.

Verb past tense (Tumakbo) + si + Name (Jose).

6

Guro si Nena.

Nena is a teacher.

Noun as predicate (Guro) + si + Name (Nena).

7

Umiiyak si Bunso.

The youngest child is crying.

Family title treated as a name (Bunso) takes 'si'.

8

Nakatulog si Lolo.

Grandfather fell asleep.

Family title (Lolo) takes 'si'.

1

Bumili si Carlos ng bagong sapatos.

Carlos bought new shoes.

Actor-focus verb (Bumili) takes 'si' for the actor.

2

Si Elena ay pumunta sa palengke.

Elena went to the market.

Inverted sentence structure using 'ay'. 'Si' stays with the name.

3

Nagluto si Nanay ng masarap na adobo.

Mother cooked delicious adobo.

'Nanay' is treated as a proper noun.

4

Uminom si Marco ng malamig na tubig.

Marco drank cold water.

Contrasting 'si' (proper noun subject) with 'ng' (common noun object).

5

Masayang nag-uusap si Rosa at si Clara.

Rosa and Clara are happily talking.

Using 'si' twice for a compound subject (though 'sina' is better).

6

Manonood si David ng sine bukas.

David will watch a movie tomorrow.

Future tense actor-focus verb with 'si'.

7

Nawawala si Bantay, ang aming aso.

Bantay, our dog, is missing.

Pet names take 'si'.

8

Mabilis tumakbo si Ben.

Ben runs fast.

Adverb + Verb + si + Name.

1

Dahil may sakit siya, hindi pumasok si Ramon sa trabaho.

Because he is sick, Ramon did not go to work.

'Si' used in the main clause after a dependent clause.

2

Sabi ni Tita, darating daw si Kuya mamayang gabi.

Auntie said that Older Brother is reportedly arriving tonight.

Mixing 'ni' for the source of information and 'si' for the subject.

3

Nagalit si Gng. Santos dahil maingay ang mga estudyante.

Mrs. Santos got angry because the students were noisy.

Using 'si' with a formal title and surname.

4

Si Dr. Reyes ang nag-opera sa pasyente kahapon.

Dr. Reyes is the one who operated on the patient yesterday.

Equational sentence where the subject is a noun phrase starting with 'Si'.

5

Kahit pagod na, nagpatuloy pa rin si Leni sa paglalakad.

Even though already tired, Leni still continued walking.

'Si' follows complex adverbial phrases.

6

Naghahanap si Mateo ng murang apartment sa Maynila.

Mateo is looking for a cheap apartment in Manila.

Actor-focus verb with extended object and location phrases.

7

Sino ba talaga si Jose Rizal para sa mga kabataan ngayon?

Who really is Jose Rizal to the youth today?

Using 'si' in complex interrogative sentences.

8

Umiyak si Ana nang malaman niya ang masamang balita.

Ana cried when she found out the bad news.

'Si' connects the main actor to a time clause.

1

Ayon sa pinakahuling balita, si Pangulong Marcos ay magbibigay ng talumpati.

According to the latest news, President Marcos will give a speech.

Formal journalistic structure using 'Ayon sa' and the 'ay' inversion.

2

Kung hindi sana umalis si Lolo, nakita niya sana ang kanyang apo.

If Grandfather hadn't left, he would have seen his grandchild.

Using 'si' in counterfactual conditional sentences.

3

Pinatunayan ng imbestigasyon na si Kapitan ang may pananagutan sa insidente.

The investigation proved that the Captain is the one responsible for the incident.

'Si' introduces the subject clause within a larger complex sentence.

4

Hindi makapaniwala si Maria na nanalo siya sa patimpalak.

Maria could not believe that she won the contest.

'Si' as the subject of a cognitive verb (makapaniwala) taking a complement clause.

5

Si Heneral Luna, na kilala sa kanyang tapang, ay pinatay ng kapwa Pilipino.

General Luna, known for his bravery, was killed by fellow Filipinos.

'Si' used with an appositive clause (na kilala...).

6

Ipinagtanggol ni Atty. Cruz si Juan laban sa mga maling paratang.

Atty. Cruz defended Juan against the false accusations.

Contrasting 'ni' (actor of object-focus verb) and 'si' (the object/focus of the defense).

7

Tila naguguluhan si G. Dimaculangan sa bagong patakaran ng kumpanya.

Mr. Dimaculangan seems confused by the company's new policy.

Using 'si' with pseudo-verbs/adverbs of probability (Tila).

8

Maging si Pedro ay hindi sumasang-ayon sa naging desisyon ng nakararami.

Even Pedro does not agree with the decision of the majority.

'Si' used with the emphatic adverb 'Maging' (Even).

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