Saya membeli sabun cair di toko dekat rumah.

Both saya and aku can mean I, but they differ in register.

• saya = neutral, polite, standard
• aku = more casual, personal, intimate

So Saya membeli sabun cair di toko dekat rumah sounds natural in standard Indonesian, especially in teaching materials. In everyday casual speech, many people might say:

• Aku beli sabun cair di toko dekat rumah.

Both are correct; the difference is mainly tone.

Membeli is the verb buy with the meN- prefix, which often marks an active verb in standard Indonesian.

• beli = buy / to buy
• membeli = to buy, in a more formal or standard grammatical form

So:

• Saya membeli sabun cair = standard/formal
• Saya beli sabun cair = very common in everyday speech

Both are natural, but membeli sounds a bit more careful or textbook-like.

Not by itself. Indonesian verbs do not usually change form for tense the way English verbs do.

So membeli does not automatically mean past tense. It could mean:

• bought
• buy
• will buy

depending on context.

For example:

• Kemarin saya membeli sabun cair. = Yesterday I bought liquid soap.
• Sekarang saya membeli sabun cair. = I am buying liquid soap now.
• Besok saya membeli sabun cair. = Tomorrow I will buy liquid soap.

In your sentence, the English translation may use bought, but the Indonesian verb itself does not mark past tense.

It is formed with the prefix meN-.

Base word:

• beli = buy

With prefix:

• meN- + beli → membeli

This happens because Indonesian has sound changes when prefixes are added. You do not need to memorize all the details at once, but it is useful to know that membeli is the standard active-verb form of beli.

In Indonesian, modifiers usually come after the noun.

• sabun = soap
• cair = liquid

So:

• sabun cair = liquid soap

This is the normal word order. It is similar to many other Indonesian noun phrases:

• rumah besar = big house
• air panas = hot water
• kopi hitam = black coffee

So sabun cair is the natural order: noun + modifier.

Cair means liquid.

So sabun cair means liquid soap, as opposed to something like bar soap. In other contexts, cair can also mean melted or not solid, depending on what is being described.

Here, di means in / at and marks a location.

• di toko = at the store / in the store

So in this sentence, di toko dekat rumah tells you where the buying happened.

Important: this di is a preposition, so it is written separately:

• di toko = at the store

This is different from the prefix di- used for passive verbs:

• dibeli = bought, was bought

So:

• di toko = correct for location
• dibeli = a verb form, not a location phrase

Indonesian does not normally use articles like a, an, or the.

So:

• toko can mean a store, the store, or just store
• rumah can mean a house, the house, home, depending on context

English requires articles, but Indonesian usually leaves them out unless extra clarification is needed.

Dekat means near / close, and in Indonesian it can directly be followed by a noun:

• dekat rumah = near the house / near home

You may also hear:

• dekat dengan rumah

That is also possible, but dekat rumah is shorter and very natural.

So in this sentence, toko dekat rumah means the store near home.

Because Indonesian often allows a noun to be followed directly by a descriptive phrase.

• toko dekat rumah = the store near home

You can also say:

• toko yang dekat rumah

This is also correct, and it may sound a little more explicitly like the store that is near home.

So:

• toko dekat rumah = natural, compact
• toko yang dekat rumah = also correct, slightly more explicit

In this sentence, dekat rumah most naturally describes toko.

So the structure is:

• di toko dekat rumah = at the store near home

That means:

• the store is near home

It does not usually mean:

• I bought liquid soap while near home

If you wanted to make the location of the action clearer in a different way, you would usually phrase it differently.

It can mean either, depending on context.

• rumah literally often means house
• but in many contexts it is naturally translated as home

So dekat rumah can be understood as:

• near the house
• near home

In English, near home often sounds more natural in a sentence like this.

Yes. That is very common in everyday Indonesian.

Compare:

• Saya membeli sabun cair di toko dekat rumah. = more standard/formal
• Saya beli sabun cair di toko dekat rumah. = more casual/everyday

Both are correct. Learners should recognize both forms.

Yes, Indonesian word order is somewhat flexible, especially with time and place phrases.

The original sentence:

• Saya membeli sabun cair di toko dekat rumah.

You could also say:

• Di toko dekat rumah, saya membeli sabun cair.

This puts more emphasis on the location. The original version is the most neutral and straightforward.

Usually at the store is the most natural English translation here.

• di can cover both in and at, depending on context
• di toko literally means being at/in the store location

In English, when talking about where you bought something, at the store is usually the best translation.

A very natural casual version would be:

• Saya beli sabun cair di toko dekat rumah. or
• Aku beli sabun cair di toko dekat rumah.

Possible differences:

• saya → more neutral/polite
• aku → more casual
• membeli → more formal
• beli → more conversational

So the original sentence is perfectly correct, but slightly more textbook or standard in tone.