Saya beli stokin tebal kerana selipar rumah saya tidak sesuai untuk cuaca sejuk.

Both are possible, but they feel a little different.

• beli is the base verb: to buy
• membeli is the more formal standard verb form

In everyday spoken Malay, people very often use the shorter base verb after the subject:

• Saya beli stokin tebal. = I bought / I buy thick socks.

In more formal writing, you may see:

• Saya membeli stokin tebal...

So this sentence is natural, especially in conversation or informal writing.

In Malay, adjectives usually come after the noun they describe.

So:

• stokin tebal = thick socks
• cuaca sejuk = cold weather

This is different from English, where adjectives usually come before the noun.

More examples:

• rumah besar = big house
• kereta merah = red car

Stokin means sock(s). It is a loanword from English.

Malay nouns usually do not change form for singular vs. plural. The same word can mean:

• a sock
• socks

The meaning depends on context.

If you really want to make the idea of a pair clearer, you could say:

• sepasang stokin = a pair of socks

But in normal usage, stokin by itself is completely fine.

Selipar rumah means house slippers or indoor slippers.

Breakdown:

• selipar = slippers
• rumah = house/home

Together, selipar rumah means slippers used in the house.

This is a common Malay pattern: one noun followed by another noun that specifies its type or purpose.

Examples:

• bilik tidur = bedroom
• meja makan = dining table

Because that second saya shows possession: my house slippers.

In Malay, possessors usually come after the noun:

• selipar rumah saya = my house slippers
• buku saya = my book
• kereta Ali = Ali’s car

Even though the sentence already starts with Saya (I), you still need another saya later to show that the slippers belong to me.

So:

• Saya beli... = I bought...
• selipar rumah saya = my house slippers

Use tidak to negate verbs and adjectives.

Here, sesuai means suitable/appropriate, which functions like an adjective, so:

• tidak sesuai = not suitable

Bukan is usually used to negate nouns or noun phrases.

Compare:

• Ini tidak mahal. = This is not expensive.
• Dia tidak datang. = He did not come.
• Ini bukan kereta saya. = This is not my car.

So in this sentence, tidak sesuai is correct.

Sesuai untuk means suitable for or appropriate for.

So:

• tidak sesuai untuk cuaca sejuk = not suitable for cold weather

A useful pattern is:

• sesuai untuk + noun

Examples:

• sesuai untuk kanak-kanak = suitable for children
• sesuai untuk kerja ini = suitable for this job

You may also see sesuai dengan, which often means suitable/matching with depending on context.

Kerana means because.

So the sentence structure is:

• Saya beli stokin tebal kerana...
• I bought thick socks because...

Yes, you can also say sebab, especially in everyday speech:

• Saya beli stokin tebal sebab selipar rumah saya tidak sesuai untuk cuaca sejuk.

Difference in tone:

• kerana = a bit more formal/written
• sebab = very common in conversation

Both are correct.

Malay usually does not use articles like English does.

So Malay often leaves this information to context.

Examples:

• stokin can mean socks, the socks, or some socks
• selipar rumah saya = my house slippers
• cuaca sejuk = cold weather

If needed, Malay can add words to be more specific, but often it does not need to.

That is why the sentence sounds natural without any direct equivalent of the or a.

Yes, literally it is weather cold, but naturally it means cold weather.

Breakdown:

• cuaca = weather
• sejuk = cold

Again, this follows the normal Malay pattern of noun + adjective:

• cuaca sejuk = cold weather

So even though the word order looks reversed from English, it is completely normal in Malay.

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

So beli can mean:

• buy
• bought
• am buying

The exact time usually comes from context or time words.

For example:

• Semalam saya beli stokin tebal. = Yesterday I bought thick socks.
• Hari ini saya beli stokin tebal. = Today I’m buying / I bought thick socks.

So if the meaning shown to the learner is I bought thick socks..., that comes from context, not from a special past-tense verb ending.

Yes, but it is a little different in style.

• stokin tebal = thick socks
• stokin yang tebal = socks that are thick

The version with yang sounds a bit more explicit or descriptive. In many simple cases, Malay prefers the shorter form without yang.

So:

• Saya beli stokin tebal is the most natural simple phrasing.
• Saya membeli stokin yang tebal is grammatical, but slightly heavier and more formal.

Like many Malay nouns, selipar does not change form for singular or plural.

So selipar can mean:

• slipper
• slippers

In this sentence, because we are talking about footwear normally used as a pair, English will usually translate it as slippers.

The same thing happens with many Malay nouns:

• buku = book / books
• kasut = shoe / shoes
• kereta = car / cars

Context tells you which meaning is intended.