si for Singular Personal Names

Si marks one personal name as the clause's pivot or as an identified personal phrase. It is the personal-name counterpart of ang, not an article meaning “the” and not a word placed before every occurrence of a name. When the named person's role or number changes, the marker changes too.

The singular personal marker series

Personal names are normally referential already. Si marks their syntactic status; it does not make an otherwise indefinite name definite.

Si in nonverbal clauses

In a neutral predicate-initial clause, a profession, property, or location comes first and the named pivot follows with si.

Filipino uses no overt present-tense copula in these clauses. English begins with the name because English requires subject-first order; neutral Filipino begins with the predicate.

An identifying construction can contain both personal and common pivot-like forms:

The sentence equates the person with an identified role. Si Mina has personal marking, while ang arkitektong... uses the common series. This does not make si or ang an article.

Voice determines whether a name takes si or ni

Under actor voice, a named actor pivot takes si.

Tumawag presents Elena as actor pivot. Marco is the personal oblique and takes kay.

Patient-oriented tawagan can select the person contacted as pivot instead.

Now si Marco is pivot and the non-pivot actor is ni Elena. The English translations can be identical, but the Filipino clauses organize the event differently. The second clause is natural when Marco or the completed call to him is central in the discourse.

Patient-voice dinala selects the transported person si Bea as pivot. Arturo takes ni, while the destination takes sa.

This page does not give the full voice paradigm. Its practical lesson is that a personal name is not permanently tied to si: predicate choice assigns its role.

Negation, questions, and contrast

Negation leaves a named pivot marked with si.

This is contrastive: someone left the key, but not Lito. Plain Hindi dumating si Lito would negate Lito's arrival instead.

The question particle ba follows the first constituent nasa tanggapan. It does not attach to the name or replace si.

The short answer keeps si. A bare name is also heard in compressed everyday replies (informal), but si Ramon is the reliable standard answer and makes the phrase role overt.

Names, titles, groups, and nonpersonal names

Si can precede a full name, surname, nickname, or title plus name when it identifies one person.

Kinship terms and titles can also behave like names in socially appropriate contexts: si Ate, si Kuya Ben, si Aling Rosa. Their use depends on relationship and register, so see kinship terms as names and titles.

Use sina, not si, for a coordinated or associated personal group.

Names of places, institutions, works, and events normally use the common/nonpersonal marker series: ang Maynila, sa Baguio, ang Pamantasang Malaya. Capitalization alone does not trigger si.

Individually named pets may take si in affectionate use (informal/affectionate), though speakers vary between personal and nonpersonal marking. Personified characters readily take si in stories (literary). These are animacy and social-treatment effects, not exceptions that make si a general proper-name article.

Direct address is not a si phrase

When a speaker calls or addresses someone directly, the name is a vocative, not a participant phrase inside the clause. It therefore normally appears without si.

Mara identifies the addressee outside the command's argument structure. By contrast, Pakiusapan mo si Mara na buksan ang bintana makes Mara a participant inside the clause and requires si. Names can also appear without markers in headings, attendance lists, signatures, and labels (label/register-specific). Those fragments do not license marker omission when the same name functions as a pivot in an ordinary sentence.

Specificity without an article

A personal name usually identifies someone, but it can be used as a newly introduced label in an existential.

This pattern is common in conversation (informal) when the speaker cannot identify which Ernesto is meant. The name follows may without si. More explicit formal prose (formal) can use May isang nagngangalang Ernesto.... Once established, the person returns to ordinary marking: Naghihintay si Ernesto sa tarangkahan.

Common Mistakes

Using ang before a personal name

Ang marks the corresponding common or nonpersonal pivot, such as ang guro.

Keeping si on a non-pivot actor

Patient-voice nakita selects the dog as ang pivot. The named actor takes ni Mara.

Using sa before a personal-name destination

Depending on context, kay Mara can mean to Mara or to the place where Mara is. Use sa with a common destination such as sa bahay ni Mara.

Using si for a coordinated pair

Use one sina before the complete named group. Separate si Ana at si Ben is possible when each name is independently emphasized, but sina Ana at Ben is the neutral group pattern.

Key Takeaways

Si marks one personal-name pivot and parallels common-noun ang. It changes to ni for a non-pivot actor or possessor and to kay for an oblique; a named group takes sina. Voice determines whether a named actor or patient is pivot. Because names are normally specific already and can occur without si in shifted existential uses, si is a role marker, not an English-style definite article.