Piliin na lang ang promo kung mahal ang unlimited data.

Because this sentence uses the object-focus form of the verb.

• piliin = choose something
• pumili = choose / make a choice, with more focus on the doer

In Piliin na lang ang promo..., the thing being chosen, ang promo, is in focus, so piliin is the natural form.

Compare:

• Pumili ka ng promo. = Choose a promo.
• Piliin mo ang promo. = Choose the promo / Choose a promo, with promo as the focused item.

In commands, Filipino often uses this kind of focus very clearly.

Yes. It is an imperative form, meaning it gives an instruction or suggestion.

So Piliin na lang ang promo means something like:

• Just choose the promo
• Choose the promo instead

Filipino commands often do not need an explicit you. The subject is understood.

Na lang is a very common expression. In this sentence, it gives the sense of:

• just
• instead
• simply
• might as well

So Piliin na lang ang promo suggests:

• choosing the promo is the practical alternative
• it may not be the first choice, but it is the sensible one in this situation

It often softens a command and makes it sound less harsh.

Because ang promo is the focused noun of the sentence.

With object-focus verbs like piliin, the thing being acted on is commonly marked by ang.

So:

• Piliin ang promo = Choose the promo
• Pumili ng promo = Choose a promo

This is a very important pattern in Filipino:

• object-focus verb → the object often takes ang
• actor-focus verb → the object often takes ng

In Filipino, promo often refers to a special offer, deal, or especially a mobile/data package.

So in this sentence, ang promo probably means something like:

• a prepaid mobile promo
• a data package
• a telecom deal

It does come from English promotion/promo, but in everyday Filipino it often has this specific practical meaning, especially in texting, mobile load, and internet contexts.

Here, kung means if.

So:

• kung mahal ang unlimited data = if unlimited data is expensive

It introduces a condition.

A learner should also know that kung can sometimes mean whether, depending on the sentence, but here it clearly means if.

Both are grammatical, but mahal ang unlimited data is the more natural everyday order.

Filipino often puts the predicate first. Here:

• mahal = expensive
• ang unlimited data = unlimited data

So the structure is:

• Expensive is unlimited data
• natural English meaning: Unlimited data is expensive

You could also say:

• Ang unlimited data ay mahal

That is also correct, but it can sound a bit more formal, explanatory, or textbook-like.

Because ang unlimited data is the topic/focused noun of that clause.

In mahal ang unlimited data:

• mahal is the predicate
• ang unlimited data is what is being described as expensive

Even though unlimited data is borrowed from English, it still behaves like a noun phrase in Filipino, so it can be marked with ang.

This is extremely common in modern Filipino, especially in everyday speech. Mixing Filipino and English is often called Taglish.

Topics like:

• technology
• telecom services
• apps
• internet plans

very often use English terms, even inside otherwise Filipino grammar.

So ang unlimited data sounds very natural in conversation. A more fully Filipino version might exist in theory, but people commonly use the English term.

Often, yes.

In this sentence, na lang can suggest:

• unlimited data would be nice,
• but if it is expensive,
• then the promo is the more practical option.

So there can be a nuance of:

• just go with this instead
• this will do
• might as well choose this

That nuance is very common with na lang.

Yes. That is a very good translation of the nuance.

Because of na lang, the sentence does not just mean a plain choose the promo. It often carries the idea of choosing it instead of something else, in this case likely unlimited data.

So possible natural translations include:

• Just choose the promo if unlimited data is expensive.
• Choose the promo instead if unlimited data is expensive.
• You might as well choose the promo if unlimited data is expensive.

Yes. In English, commands usually need an understood you, and the same idea applies here.

So Piliin na lang ang promo... really means:

• You choose the promo instead...
• Just choose the promo...

Filipino usually leaves that pronoun unstated in commands because it is already understood from context.

Very literal word-for-word order would look something like this:

• Piliin = choose
• na lang = just / instead
• ang promo = the promo
• kung = if
• mahal = expensive
• ang unlimited data = the unlimited data

So a very literal gloss would be:

• Choose instead the promo if expensive the unlimited data

That sounds unnatural in English, but it shows how Filipino is built:

1. command verb first
2. focused noun
3. conditional clause
4. predicate-first structure inside that clause

This kind of breakdown is useful for understanding Filipino word order.