kapag / kung

Expected When Versus Hypothetical if

Level 4

Kung = If (Uncertain/Hypothetical)
Kapag = When (Certain/Recurring)

How It Works

In Filipino, choosing between these two conjunctions depends on the speaker's perspective of the event's likelihood and timing:

  • Kung (If / Whether): Used for conditions that are uncertain, purely hypothetical, or counterfactual (e.g., 'If I were you'). Unlike kapag, kung is highly flexible and can be used with the completed aspect for past hypotheticals, the progressive aspect for ongoing conditions, or the contemplated aspect for future possibilities. For counterfactuals (events that did not happen), kung is typically paired with the particle sana. It also functions as a complementizer for 'whether' clauses.
  • Kapag (When / Whenever / Once): Used for events that are expected to happen eventually or for recurring habits. In casual speech, this is very often shortened to 'pag. When used with the completed aspect, it translates to 'once [action] is done.'

While kung is sometimes used interchangeably with kapag in casual speech to mean 'when,' kapag can never be used to mean 'whether' or to introduce a counterfactual. Note that unlike noong, which is used for 'when' in the past, kapag is strictly for the future or the habitual present.

Examples (6)

  1. Ano ang gagawin mo kung manalo ka sa lotto?

    What will you do if you win the lottery?

    Word by Word: What the will-do you if win you in-the lottery?

    Uses 'kung' because winning the lottery is a hypothetical possibility, not a certainty.

  2. Tawagan mo ako kapag dumating ka na sa bahay.

    Call me when you arrive home.

    Word by Word: Call you me when arrive you already at house.

    Uses 'kapag' because the speaker expects the person to eventually arrive home.

  3. Hindi ko alam kung darating siya.

    I don't know if/whether he is coming.

    Word by Word: Not by-me known if will-arrive he.

    Here 'kung' functions as 'whether' in an indirect question.

  4. Kapag umuulan, nababasa ang sahig.

    Whenever it rains, the floor gets wet.

    Word by Word: When is-raining, gets-wet the floor.

    Uses 'kapag' to describe a recurring, habitual event (whenever).

  5. 'Pag kumain ka na, uminom ka ng gamot.

    Once you have eaten, take your medicine.

    Word by Word: When ate you already, drink you of medicine.

    Uses the short form ''pag' with a completed verb to mean 'once' or 'after' a certain condition is met.

  6. Kung nag-aral ka sana, pumasa ka sa pagsusulit.

    If you had studied, you would have passed the exam.

    Word by Word: If studied you hopefully, passed you in-the exam.

    Uses 'kung' paired with the particle 'sana' and the completed aspect to express a counterfactual condition—something that did not actually happen in the past.

Common Mistakes

  • 'Kung' means 'if' here, not 'when'.

    Different MeaningKung pumunta ako sa Maynila kahapon...
    Noong pumunta ako sa Maynila kahapon...

    'Kung pumunta ako sa Maynila kahapon…' is a good sentence meaning 'if I went to Manila yesterday'. To say 'when' for a finished past event, use 'noong'.

  • 'Kung' means 'if'; 'kapag' means 'when'.

    Different MeaningKung mag-aalas dose na, kakain tayo.
    Kapag mag-aalas dose na, kakain tayo.

    'Kung mag-aalas dose na, kakain tayo' is natural and means 'if it gets to twelve, we eat'. 'Kapag' says 'when' or 'whenever' and fits a time that will surely come.

How It Connects

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kapag / kungLevel 4Expected When Versus Hypothetical if

Learn This First

This comparison helps you understand the differences between kapag and kung. Study each pattern individually first.

Words in This Pattern