Kakak saya mencuci rambutnya dengan syampu baharu kerana dia mahu kelihatan kemas di pejabat.

In this sentence, kakak saya most naturally means my older sister.

But kakak is broader than English sister in some situations. It can also be used:

• for an older female sibling
• as a polite way to address or refer to a slightly older woman
• sometimes for a woman in an older-sister-like social role

Here, because it is followed by saya (my), the usual reading is my older sister.

Saya is the more neutral and polite word for I / my.

So:

• kakak saya = my older sister
• kakak aku = also my older sister, but more casual and less formal

A learner should know:

• saya is safe in most situations
• aku is informal and used with close friends, family, or in relaxed speech
• in writing and standard examples, saya is very common

Mencuci is the verb to wash.

It comes from the root cuci (wash) plus the prefix meN-, which often forms an active verb.

So:

• cuci = the basic root
• mencuci = to wash / washing

In a full sentence, Malay often uses the prefixed form:

• Kakak saya mencuci rambutnya = My older sister washes/is washing her hair

Using just cuci is possible in very informal speech or commands, but mencuci is the standard sentence form here.

Yes, there can be a slight difference, although both can relate to washing.

• mencuci often means to clean by washing
• membasuh also means to wash, but can sound a bit more general or literal depending on context

For hair, mencuci rambut is very natural.
You may also hear membasuh rambut, but mencuci rambut fits very well, especially when shampoo is mentioned.

In everyday Malay, these verbs sometimes overlap, but they are not always identical in nuance.

Rambutnya = rambut + -nya

• rambut = hair
• -nya = his / her / its

So rambutnya means:

• his hair
• her hair

Malay does not mark gender here, so you need context.

In this sentence, it most likely means her hair, because dia later in the sentence is most naturally understood as referring to kakak saya.

Also, with body parts, Malay very commonly uses -nya:

• mencuci rambutnya = wash his/her hair

You could also hear mencuci rambut dia, but rambutnya is more compact and very natural.

Usually, that is the most natural interpretation here: she washed her own hair.

But grammatically, rambutnya does not by itself force a reflexive meaning. It simply means his/her hair. So in another context, it could refer to someone else’s hair.

If you wanted to make her own hair extra explicit, you could say:

• rambutnya sendiri

So:

• dia mencuci rambutnya = she washed her hair / his hair, depending on context
• dia mencuci rambutnya sendiri = she washed her own hair

In Malay, adjectives usually come after the noun.

So:

• syampu baharu = new shampoo
• rumah besar = big house
• baju merah = red shirt

That is the normal word order:

• noun + adjective

So syampu baharu is exactly what you would expect in Malay.

Yes, mostly in style and usage.

Both can mean new, but:

• baharu is more formal or standard in careful writing
• baru is more common in everyday speech

So both of these can work:

• syampu baharu
• syampu baru

One extra point: baru also has another common meaning, just / only recently:

• Dia baru sampai = He/She just arrived

Because of that, baharu can sometimes sound clearer or more formal when you specifically mean new.

Here, dengan means with, showing the instrument or means used.

So:

• mencuci rambutnya dengan syampu baharu = washing her hair with new shampoo

In other contexts, dengan can also mean:

• with in the sense of togetherness
• with in the sense of manner
• with in the sense of using something

In this sentence, it clearly means using the shampoo.

Yes. Kerana and sebab can both mean because.

• kerana is a bit more formal or standard
• sebab is very common in everyday speech

So both are possible:

• ... kerana dia mahu kelihatan kemas di pejabat
• ... sebab dia mahu kelihatan kemas di pejabat

The version with kerana sounds a little more polished or written.

Mahu means want to.

In this sentence:

• dia mahu kelihatan kemas = she wants to look neat

Related words:

• mahu = want; neutral and common
• hendak = want / intend; sometimes a bit more formal or purposeful
• ingin = desire / wish; more formal or expressive
• nak = colloquial spoken form of hendak/mahu

So you may hear:

• dia mahu kelihatan kemas
• dia hendak kelihatan kemas
• dia nak nampak kemas

All are possible, but they differ in register.

Here, kelihatan means to look / appear / seem.

So:

• mahu kelihatan kemas = want to look neat

This is different from lihat, which usually means to see or look at something.

Compare:

• Saya melihat dia = I see / am looking at him/her
• Dia kelihatan kemas = He/She looks neat

So:

• lihat / melihat = the action of seeing
• kelihatan = to appear, seem, look

That is why kelihatan is the correct choice here.

Yes, definitely.

• kelihatan kemas = sounds a bit more formal or standard
• nampak kemas = very natural and common in everyday speech

So these are both fine:

• dia mahu kelihatan kemas di pejabat
• dia mahu nampak kemas di pejabat

The meaning is very similar: she wants to look neat at the office.

Here, kemas means something like:

• neat
• tidy
• well-groomed
• presentable

When used about appearance, kemas suggests that someone looks orderly and proper.

So kelihatan kemas di pejabat means she wants to look neat and presentable at work.

Because di marks a location, while ke marks movement toward a destination.

• di pejabat = at the office / in the office
• ke pejabat = to the office

In this sentence, the meaning is that she wants to look neat at the office, so di pejabat is correct.

Compare:

• Dia bekerja di pejabat = She works at the office
• Dia pergi ke pejabat = She goes to the office

In this sentence, yes, that is the most natural reading.

So:

• Kakak saya ... kerana dia mahu ... normally means
• My older sister ... because she wants ...

However, Malay pronouns can sometimes be ambiguous, because dia does not show gender and can refer back to different people if the context allows it.

If the speaker wanted to make it extra clear, they might repeat the noun:

• Kakak saya mencuci rambutnya dengan syampu baharu kerana kakak saya mahu kelihatan kemas di pejabat.

But that sounds a bit repetitive. In normal usage, dia is perfectly fine.

Malay verbs do not change form for tense the way English verbs do.

So mencuci itself does not specifically mean:

• washed
• washes
• is washing
• will wash

The time is usually understood from context or from time words such as:

• semalam = yesterday
• sekarang = now
• esok = tomorrow

Without a time marker, this sentence could be understood in different ways depending on context, though it most naturally feels like a present or general statement:

• My older sister is washing / washes her hair with new shampoo because she wants to look neat at the office.

Because Malay does not usually use articles in the same way English does.

So:

• syampu baharu can mean a new shampoo or the new shampoo, depending on context
• pejabat can mean an office, the office, or simply office in a general sense

Malay often leaves this unspecified unless the context makes it clear or the speaker adds another word.

That is normal, not something missing.