Properti dan kostum sudah siap.

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

So:

• Properti dan kostum sudah siap.
• literally: Props and costumes already ready
• natural English: The props and costumes are already ready.

This is completely normal Indonesian. When the predicate is an adjective like siap (ready), you usually do not need a word meaning are.

Sudah means already, and more broadly it marks that something has been completed or has reached a state.

In this sentence:

• sudah siap = already ready

It tells you the props and costumes have now reached the state of being ready.

Very common uses of sudah:

• Saya sudah makan. = I already ate / I have eaten.
• Dia sudah datang. = He/She has arrived already.
• Semuanya sudah siap. = Everything is ready already.

In casual speech, people often say udah instead of sudah.

In Indonesian, sudah usually comes before the word or phrase it modifies.

So:

• sudah siap = already ready
• sudah makan = already eaten / already ate
• sudah datang = already arrived

That word order is the normal one.

Siap means ready, prepared, or set depending on context.

Here it means:

• Properti dan kostum sudah siap.
• The props and costumes are ready already.

A few more examples:

• Saya siap. = I’m ready.
• Kami belum siap. = We’re not ready yet.
• Makanannya siap. = The food is ready.

It is usually used as an adjective in sentences like this.

Indonesian nouns usually do not change form for singular or plural.

So:

• properti can mean prop or props
• kostum can mean costume or costumes

The number is usually understood from context.

If someone really wants to emphasize plurality, Indonesian can use:

• reduplication: kostum-kostum
• a number: dua kostum = two costumes
• a context clue like semua = all

But in ordinary sentences, leaving nouns unmarked for number is very common.

Not always. Properti in Indonesian can mean different things depending on context.

In entertainment contexts, properti often means props used for a performance, film, photo shoot, or stage production.

So in this sentence, properti dan kostum most likely means:

• props and costumes

In other contexts, properti can also refer to property/real estate, but that is a different usage.

So even though the word looks like English property, here it is probably best understood as props.

Yes. Kostum is a loanword ultimately related to English costume.

Its meaning is very similar:

• theatrical costume
• special outfit
• costume for an event or performance

In Indonesian pronunciation and spelling, it has been adapted as kostum.

So properti dan kostum is a very natural pairing in contexts like theater, film, dance, or events.

The basic structure is:

• Properti dan kostum = subject
• sudah siap = predicate

More specifically:

• Properti = noun
• dan = and
• kostum = noun
• sudah = aspect marker meaning already
• siap = adjective meaning ready

So the pattern is:

Noun phrase + sudah + adjective

This is a very common Indonesian sentence pattern.

Yes. That would also be grammatical.

• Properti dan kostum siap. = The props and costumes are ready.
• Properti dan kostum sudah siap. = The props and costumes are already ready.

The version with sudah adds the idea that the state of readiness has already been reached.

So the sentence without sudah is more neutral, while the sentence with sudah emphasizes completion or a change of state.

You would usually use belum or tidak, depending on what you mean.

Most natural:

• Properti dan kostum belum siap.
• The props and costumes are not ready yet.

Also possible:

• Properti dan kostum tidak siap.
• The props and costumes are not ready.

Difference:

• belum siap = not ready yet
  This suggests they may become ready later.
• tidak siap = not ready
  This is a more direct negation and does not imply yet.

Since the original sentence uses sudah, the natural opposite is usually belum.

Indonesian does not have articles that work exactly like English a/an/the.

So a noun can often stand alone:

• properti
• kostum
• rumah
• mobil

Whether it means a, the, or just a general noun depends on context.

So:

• Properti dan kostum sudah siap.

could mean:

• The props and costumes are ready already or
• Props and costumes are ready already

English usually requires an article, but Indonesian often does not.

Yes, it can technically refer to either, because Indonesian nouns often do not show number.

So:

• properti dan kostum could mean a prop and a costume
• or props and costumes

In real usage, context decides.

However, because properti in performance contexts often refers to props collectively, many learners will naturally understand this sentence as:

• The props and costumes are already ready.

It is neutral and perfectly normal.

• Properti dan kostum sudah siap. sounds fine in everyday speech and in workplace or production settings.
• A more casual spoken version might be: Properti dan kostum udah siap.
• A slightly more formal version might still use sudah, but the sentence is already acceptable in many formal situations.

So this is a very useful, natural sentence pattern to learn.