Bingkai kayu itu sudah lapuk.

In Indonesian, the main noun usually comes first, and the word that describes it comes after.

So:

• bingkai = frame
• kayu = wood

Together, bingkai kayu means wooden frame or frame made of wood.

This is the normal Indonesian pattern:

• rumah kayu = wooden house
• meja makan = dining table
• gelas kaca = glass cup / cup made of glass

So kayu is functioning a bit like the English adjective wooden, even though it is literally the noun wood.

Itu often means that, but in sentences like this it can also make the noun phrase definite, closer to the in English.

So bingkai kayu itu can mean:

• that wooden frame
• the wooden frame

Which one sounds best depends on context.

A useful thing to notice is that itu comes at the end of the whole noun phrase:

• bingkai kayu itu not
• itu bingkai kayu

That is very common in Indonesian.

Because in Indonesian, demonstratives like ini and itu usually come after the noun phrase they refer to.

So:

• rumah itu = that house
• mobil baru itu = that new car
• bingkai kayu itu = that wooden frame

If there is a noun plus a modifier, itu normally goes after the whole unit.

Indonesian often does not use a verb like English to be in simple present statements.

So instead of saying something like The wooden frame is already rotten, Indonesian can simply say:

• Bingkai kayu itu sudah lapuk.

This is completely normal. The adjective lapuk acts as the predicate.

You see the same pattern in:

• Dia sakit. = He is sick.
• Rumah itu besar. = The house is big.
• Mereka senang. = They are happy.

Sudah often means already, but its basic idea is that something has been completed or has reached a new state.

In this sentence, sudah lapuk means something like:

• is already decayed
• has become decayed
• is by now worn/rotten

So sudah shows a change or result: the frame is no longer in good condition; it has reached the state of being lapuk.

Yes. That is very common in Indonesian.

English learners often first meet sudah with verbs:

• Saya sudah makan. = I already ate / I have eaten.

But sudah can also appear before adjectives or stative words:

• sudah tua = already old
• sudah siap = already ready
• sudah dingin = already cold
• sudah lapuk = already decayed

So sudah is not limited to action verbs.

Lapuk describes something that has become decayed, rotten, worn out, or weakened with age, especially materials like wood, cloth, paper, or other things that deteriorate over time.

For wood, lapuk suggests that it has aged and deteriorated, possibly becoming soft, weak, or crumbly.

It is not exactly the same as every English word:

• rotten can be a good translation in many cases
• decayed is often more precise
• worn out can fit in some contexts
• brittle or fragile may be part of the result, but not the full meaning

So in this sentence, lapuk suggests the wooden frame has deteriorated with age or exposure.

Both are grammatical, but they are slightly different.

• Bingkai kayu itu lapuk = The wooden frame is decayed / rotten.
• Bingkai kayu itu sudah lapuk = The wooden frame is already decayed / has become decayed.

Adding sudah emphasizes that the state has been reached, often with a sense of by now, already, or now it has become this way.

So sudah makes the sentence feel a little more result-focused.

Not exactly in the traditional English grammar sense. Kayu is still a noun meaning wood, but in Indonesian nouns can modify other nouns very naturally.

So in bingkai kayu, the noun kayu works like a modifier, giving a meaning similar to English wooden.

This is one reason Indonesian can feel very compact:

• sepatu kulit = leather shoes
• meja kayu = wooden table
• pintu kaca = glass door

So it is fine to think of kayu here as meaning wooden, even though the word itself is literally wood.

Yes, it could be omitted, but the meaning would become less definite.

• Bingkai kayu itu sudah lapuk. = The/that wooden frame is already decayed.
• Bingkai kayu sudah lapuk. = A wooden frame / wooden frames / wooden frame in general is already decayed, depending on context

In real Indonesian, definiteness is often understood from context, so speakers do sometimes leave out itu. But with itu, the sentence more clearly points to a specific frame.

A simple pronunciation guide is:

bing-kai kah-yoo ee-too soo-dah lah-pook

A few notes:

• ng in bingkai sounds like the ng in sing
• ai in bingkai sounds like eye
• u in kayu, itu, sudah, and lapuk is like oo in food
• Stress in Indonesian is usually not as strong or dramatic as in English

So try to say it smoothly and evenly rather than heavily stressing one word.