Ibu membeli obat flu di apotek karena saya pilek.

Ibu can mean several related things in Indonesian:

• mother / mom
• Mrs. / ma’am
• a respectful way to address an adult woman

In this sentence, Ibu most naturally means my mother / Mom, depending on context. Indonesian often leaves out possessives like my when they are already understood, so Ibu membeli... can naturally mean Mother bought... or Mom bought....

The capital letter suggests it is being used like a name or title here, similar to Mom in English.

Beli is the basic root meaning buy.
Membeli is the active verb form built from that root.

This is very common in Indonesian:

• beli = buy / to buy
• membeli = to buy, buys, bought in an active sentence

In full standard Indonesian, membeli is the normal form in a sentence like this:

• Ibu membeli obat flu... = Mother bought flu medicine...

In casual speech, people sometimes drop the prefix and say Ibu beli obat flu, but membeli is the more standard form.

The prefix meN- (which changes shape depending on the next sound) often marks an active verb.

Here:

• root: beli
• active verb: membeli

The prefix changes form because of sound rules. Before b, meN- becomes mem-, so:

• meN- + beli → membeli

You do not need to translate mem- by itself. It is just part of how Indonesian builds many verbs.

Obat means medicine or remedy.
Flu means flu.

So obat flu literally means flu medicine or medicine for flu.

In Indonesian, noun + noun combinations like this are very common:

• obat flu = flu medicine
• obat batuk = cough medicine
• obat sakit kepala = headache medicine

English often uses for in these phrases, but Indonesian usually does not need a separate word.

That is a very natural question, because flu and pilek are not exactly the same thing.

• flu usually refers to influenza, but in everyday Indonesian it can also be used a bit loosely
• pilek usually means having a cold, especially a runny or blocked nose

In everyday speech, people may not always use these terms very strictly. So obat flu can sometimes refer broadly to medicine for cold-like symptoms, not only true influenza.

So even if saya pilek means I have a cold / I’m sniffly / I have a runny nose, buying obat flu can still sound natural.

Pilek usually refers to having a cold, especially with nose symptoms like:

• a runny nose
• a stuffy nose
• sniffles

So saya pilek means something like:

• I have a cold
• I’m sniffly
• I have a runny nose

It does not always mean the same thing as English flu, which is usually more serious.

In Indonesian, many states or conditions can be expressed very simply:

• saya pilek = I have a cold
• saya sakit = I am sick
• saya lapar = I am hungry

You do not always need extra words.

Adding sedang would emphasize that it is happening right now:

• saya sedang pilek = I’m currently having a cold

But saya pilek already sounds natural and complete.

As for saya sakit pilek, that is less natural in this context. Usually you would say either:

• saya sakit = I’m sick
• saya pilek = I have a cold

Indonesian often does not use a verb like to be in the way English does.

So:

• saya pilek literally looks like I cold
• but it means I have a cold or I’m suffering from a cold

This is normal in Indonesian. Compare:

• saya lapar = I am hungry
• dia marah = he/she is angry
• mereka sibuk = they are busy

English needs am/is/are here, but Indonesian usually does not.

Good question. These two prepositions are different:

• di = in / at
• ke = to (movement toward a place)

So:

• di apotek = at the pharmacy
• ke apotek = to the pharmacy

In the sentence Ibu membeli obat flu di apotek, the focus is on where the buying happened: at the pharmacy.

If you said Ibu pergi ke apotek, that would mean Mother went to the pharmacy.

Apotek means pharmacy or drugstore. It is the place where medicine is sold.

In many contexts, apotek matches English pharmacy very well. So di apotek = at the pharmacy is a very good translation.

Karena means because.

The reason clause starts at karena:

• Ibu membeli obat flu di apotek = main statement
• karena saya pilek = reason

So the structure is:

• [main action] + karena + [reason]

This is very similar to English:

• Mother bought flu medicine at the pharmacy because I have a cold.

Yes, absolutely.

Both are natural:

• Ibu membeli obat flu di apotek karena saya pilek.
• Karena saya pilek, Ibu membeli obat flu di apotek.

The second version puts the reason first, which can give it a little more emphasis, just like in English:

• Because I have a cold, Mother bought flu medicine at the pharmacy.

Because Indonesian often leaves out information that is obvious from context.

• ibu saya = my mother
• Ibu by itself can still mean Mom / Mother if everyone already knows whose mother is meant

This is especially common in everyday speech. If the speaker is clearly talking about their own family, Ibu is often enough.

It is mostly standard and natural, but still easy and everyday.

A few points:

• membeli is standard and a bit more complete than casual beli
• Ibu is polite and natural
• di apotek and karena are standard

In very casual conversation, someone might say:

• Ibu beli obat flu di apotek karena saya pilek.

That sounds more conversational, but the original sentence is perfectly normal Indonesian.