Mbak penjual itu membantu saya memilih yogurt dan biskuit untuk sarapan besok.

Mbak is a polite way to address or refer to a young woman or an older sister-like woman, especially in Java and in Indonesian everyday speech.

In this sentence, Mbak penjual itu means something like that saleswoman / that female seller.

A few useful notes:

• Mbak is not exactly the same as Miss in English.
• It is often used as a respectful everyday form of address for a woman.
• You may also hear Mas for a man.

So Mbak penjual itu sounds natural and polite.

In Indonesian, itu usually comes after the noun it describes.

So:

• penjual itu = that seller
• rumah itu = that house
• orang itu = that person

Here, Mbak penjual itu literally follows the Indonesian pattern:

• Mbak penjual = the female seller / saleswoman
• itu = that

So the noun phrase is built in the order:

• Mbak penjual itu = that saleswoman

This is different from English, where that usually comes before the noun.

Indonesian does not normally use articles like the and a/an.

That means a noun like penjual can mean:

• a seller
• the seller
• simply seller

The exact meaning depends on context.

In this sentence, itu helps make it specific, so penjual itu means that seller, which is naturally understood as a specific person.

It means helped me choose or helped me in choosing.

Breakdown:

• membantu = to help
• saya = me / I
• memilih = to choose

So:

• membantu saya memilih yogurt dan biskuit = helped me choose yogurt and biscuits

A useful pattern in Indonesian is:

• membantu + person + verb

For example:

• Dia membantu saya mencari buku. = He/She helped me look for a book.
• Ibu membantu anaknya belajar. = The mother helped her child study.

Memilih is the active verb form built from the root pilih.

• pilih = choose / selection root
• memilih = to choose

The prefix meN- often marks an active verb in Indonesian.

So in normal, complete sentences, memilih is usually the form you expect:

• Saya memilih roti. = I choose bread.

The shorter root pilih can appear in commands or less formal contexts, such as:

• Pilih satu. = Choose one.

So here memilih is the standard grammatical form.

Indonesian does not need a separate word like English to in this kind of structure.

English can say:

• helped me choose
• helped me to choose

Indonesian simply uses:

• membantu saya memilih

So after membantu, the next verb can come directly.

This is very normal in Indonesian.

Untuk usually means for.

Here, untuk sarapan besok means:

• for tomorrow’s breakfast
• or more literally, for breakfast tomorrow

So the sentence is saying that the seller helped the speaker choose yogurt and biscuits for breakfast tomorrow.

Other examples:

• untuk makan malam = for dinner
• untuk hadiah = for a gift
• untuk saya = for me

In this sentence, sarapan besok is most naturally understood as breakfast tomorrow or tomorrow’s breakfast.

• sarapan can be a noun: breakfast
• it can also be a verb: to have breakfast

After untuk, this phrase is understood as a purpose/time expression: the yogurt and biscuits are intended for breakfast tomorrow.

So the full idea is:

• The saleswoman helped me choose yogurt and biscuits for tomorrow’s breakfast.

Besok means tomorrow, and Indonesian often places time words after the noun or phrase they relate to.

So:

• sarapan besok = breakfast tomorrow

This sounds natural in Indonesian.

You could also hear related variations, depending on emphasis or style, such as:

• untuk besok pagi
• untuk sarapan pagi besok

But the original sentence is perfectly natural.

Yes, saya is the more neutral and polite word for I / me.

In this sentence:

• membantu saya memilih = helped me choose

You could replace saya with aku in casual speech:

• Mbak penjual itu membantu aku memilih yogurt dan biskuit untuk sarapan besok.

That would sound more informal and personal.

So:

• saya = polite, neutral, common in many situations
• aku = informal, used with friends, family, or in a casual tone

They are loanwords.

• yogurt is borrowed and spelled the same way as in English in modern Indonesian usage
• biskuit is the Indonesian spelling of biscuit

Indonesian often adapts foreign words to its own spelling system. For example:

• musik = music
• televisi = television
• praktis = practical

So biskuit looks different from English, but it is a normal Indonesian word.

The basic structure is:

• Mbak penjual itu = subject
• membantu = verb
• saya = object
• memilih yogurt dan biskuit = verb phrase complement
• untuk sarapan besok = purpose/time phrase

So the sentence follows a very common Indonesian pattern:

• Subject + Verb + Object + Extra information

More literally:

• That saleswoman helped me choose yogurt and biscuits for breakfast tomorrow.

Normally, no. If you want to clearly list two items, dan is the standard word for and.

So:

• yogurt dan biskuit = yogurt and biscuits

Without dan, it would sound incomplete or unnatural in standard Indonesian, unless it were part of a very informal list or spoken fragment.

Penjual literally means seller or vendor, someone who sells something.

Depending on context, English translations could include:

• seller
• saleswoman
• shop assistant
• vendor

In this sentence, because she is helping choose products, saleswoman or shop assistant may sound most natural in English. But the Indonesian word itself is more generally seller.