Tunggakan sewa itu sudah dua bulan.

Tunggakan sewa means rent arrears, overdue rent, or unpaid rent that has built up.

• tunggakan = arrears, something overdue, an outstanding amount
• sewa = rent / rental

So together, tunggakan sewa refers to rent payments that have not been paid on time.

In Malay, the main noun usually comes first, and the word that describes or specifies it comes after.

So:

• tunggakan sewa = arrears of rent
• literally: arrears rent

This is a very common Malay noun pattern:

• rumah sewa = rental house
• wang sekolah = school money / school fees
• bil elektrik = electricity bill

So sewa comes after tunggakan because it tells you what kind of arrears they are.

Itu here points to a specific, known thing. In many contexts, it works a bit like that or sometimes like the, depending on the situation.

So:

• tunggakan sewa itu = that rent arrears / the rent arrears in question

In natural English, you may not always translate itu directly as that. Sometimes it just marks that the speaker and listener both know which arrears are being talked about.

Also notice the position: in Malay, itu comes after the noun phrase:

• rumah itu = that house / the house
• orang itu = that person
• tunggakan sewa itu = that/the rent arrears

Sudah often means already, but in this sentence it is better understood as showing that a state has reached or has now become something.

So sudah dua bulan suggests:

• it has already reached two months
• it is now two months overdue
• the arrears have been there for two months

This use of sudah is very common when talking about time, duration, or a changed state:

• Saya sudah lama di sini. = I’ve been here a long time already.
• Dia sudah tiga hari sakit. = He has been sick for three days.

Malay often does not use a copula like English is / am / are in simple statements.

So where English says:

• The rent arrears are two months old
• The overdue rent is two months

Malay can simply say:

• Tunggakan sewa itu sudah dua bulan.

This is completely normal. Malay often leaves out is/are when linking a subject to a description, noun, or time expression.

For example:

• Dia guru. = He/She is a teacher.
• Rumah itu besar. = That house is big.
• Anak saya lima tahun. = My child is five years old.

Dua bulan literally means two months. In this sentence, it refers to the length of time the rent has been in arrears.

So the idea is:

• the rent has been overdue for two months
• the arrears amount to two months

Which English wording fits best depends on context. For example, it could mean:

• The rent is two months overdue.
• There are two months of rent arrears.

Malay often leaves this slightly broader, and context tells you which nuance is intended.

Very often, yes, that is the natural idea.

In sentences about duration, sudah + time period commonly means that something has lasted for that amount of time up to now.

Examples:

• Saya sudah di sini dua jam. = I’ve been here for two hours.
• Dia sudah menunggu tiga puluh minit. = He/She has been waiting for thirty minutes.

So in your sentence, sudah dua bulan gives the sense of has been like this for two months or has already reached two months.

Yes, you might hear:

• Tunggakan sewa itu dua bulan.

But sudah makes the sentence sound more natural when talking about a state that has continued up to the present or has reached a certain duration.

Compare:

• Tunggakan sewa itu dua bulan.
  More bare, more like stating a fact: The arrears are two months.

• Tunggakan sewa itu sudah dua bulan.
  More clearly: The arrears have already reached two months / The rent has been overdue for two months.

So sudah adds a sense of elapsed time or development.

Here, sewa functions as a noun, meaning rent or rental payment.

Malay words can often function in more than one way depending on context. For example:

• Saya mahu sewa rumah. = I want to rent a house.
  Here sewa behaves like a verb.

• Sewa rumah itu mahal. = The rent for that house is expensive.
  Here sewa behaves like a noun.

In tunggakan sewa, it is clearly a noun because it names the type of arrears.

Yes. Tunggakan is a general word for something in arrears or overdue, especially money owed.

For example:

• tunggakan bayaran = payment arrears
• tunggakan cukai = tax arrears
• tunggakan pinjaman = loan arrears

So tunggakan sewa is just one specific kind of tunggakan.

The structure is:

• Tunggakan sewa itu = subject noun phrase
• sudah dua bulan = predicate describing its current duration/state

So the sentence pattern is roughly:

[noun phrase] + [sudah + time expression]

This is a very common Malay way to say that something has lasted for a certain amount of time.

A native speaker would usually understand it as something like:

• The rent is two months overdue.
• The rent arrears are two months old.
• There are two months of rent arrears.

The best English version depends on context, but the core idea is that the unpaid rent has accumulated for two months.