Kalau semua dokumen sudah dicetak dan sudah ada tanda tangannya, tinggal kirim amplopnya besok pagi.

Here kalau introduces a condition: if / when.

So Kalau semua dokumen sudah dicetak ... means If all the documents have been printed ...

The difference is mostly about register:

• kalau = very common in everyday speech and writing
• jika = more formal, more common in official or written styles

In many contexts they mean the same thing. In this sentence, kalau sounds natural and conversational.

Because it applies to two separate things:

• semua dokumen sudah dicetak = all the documents have already been printed
• sudah ada tanda tangannya = the signature is already there / it has already been signed

Repeating sudah makes the structure clearer and more balanced. Indonesian often does this instead of letting one sudah cover the whole clause.

You might hear a shorter version in casual speech, but repeating it is very normal and natural.

dicetak is a passive form.

• root: cetak = print
• mencetak = to print (active)
• dicetak = to be printed (passive)

So:

• Semua dokumen sudah dicetak = All the documents have been printed

Indonesian often uses the passive when the result matters more than who did it. In this sentence, the speaker cares that the documents are ready, not who printed them.

This part literally looks like:

• sudah = already
• ada = there is / exists
• tanda tangan = signature
• -nya = its / the / his-her, depending on context

So sudah ada tanda tangannya literally means something like:

• the signature is already there
• it already has the signature on it

This is a very natural Indonesian way to express the idea of something already being signed, without directly using a verb like sign.

The -nya makes the noun more specific.

• tanda tangan = signature / a signature
• tanda tangannya = the signature / its signature / the signature on it

In this sentence, -nya points to the relevant documents. It helps give the sense that the needed signature is already attached or present.

This -nya does not always mean a clear English his/her/its. Very often it simply makes something definite, like the in English.

In modern Indonesian, tanda tangan is commonly written as two words and functions as a noun meaning signature.

Examples:

• ada tanda tangan = there is a signature
• minta tanda tangan = ask for a signature

If you want the verb to sign, Indonesian often uses:

• menandatangani = to sign
• ditandatangani = to be signed

So this sentence uses the noun expression ada tanda tangannya rather than the verb ditandatangani.

Correct. Here tinggal does not mean to live.

In this sentence, tinggal means:

• all that remains is...
• just...
• simply...

So:

• tinggal kirim amplopnya besok pagi
  = then all that’s left is to send the envelope tomorrow morning

This is a very common Indonesian use of tinggal:

• Tinggal bayar. = You just need to pay.
• Tinggal tunggu hasilnya. = Now you just wait for the result.

After tinggal, Indonesian often uses a bare verb in a concise, spoken-style structure:

• tinggal kirim
• tinggal bayar
• tinggal tunggu

So tinggal kirim amplopnya is very natural.

A fuller version like tinggal mengirim amplopnya is also possible, but it can sound a bit more formal or heavier. In everyday Indonesian, the shorter version is very common.

amplop = envelope

amplopnya can mean:

• the envelope
• its envelope
• the envelope in question

Here, the most natural understanding is the envelope—the specific envelope associated with those documents.

Again, -nya often works like a marker of definiteness, not just possession. So it does not necessarily mean someone owns the envelope; it just means the relevant envelope is understood from context.

Indonesian is flexible about word order, especially for time expressions. Putting besok pagi at the end is very natural.

• tinggal kirim amplopnya besok pagi
• besok pagi tinggal kirim amplopnya

Both are possible.

The end position keeps the flow natural:

1. condition
2. result/action
3. time of that action

So the sentence first says the documents must be ready, then says the remaining step, then gives the time: tomorrow morning.

Yes, you can think of the sentence as having an implicit subject.

Indonesian often leaves out subjects when they are obvious from context. The sentence does not explicitly say you, we, or someone must send the envelope.

So tinggal kirim amplopnya besok pagi could imply:

• you just need to send the envelope tomorrow morning
• we just need to send the envelope tomorrow morning
• then the envelope just needs to be sent tomorrow morning

The exact subject depends on context.

Yes. A possible alternative is:

• Kalau semua dokumen sudah dicetak dan sudah ditandatangani, tinggal kirim amplopnya besok pagi.

That means:

• If all the documents have been printed and signed, just send the envelope tomorrow morning.

The difference is mostly in expression:

• sudah ada tanda tangannya focuses on the presence of the signature
• sudah ditandatangani focuses on the action of being signed

Both are natural. The version with ada tanda tangannya can sound a little more concrete and everyday.

It is very natural and sounds like normal everyday Indonesian. It is not slangy, but it is also not highly formal.

Features that make it sound conversational:

• kalau instead of jika
• tinggal kirim instead of a more formal phrasing
• sudah ada tanda tangannya instead of a more official passive form

A more formal version might be something like:

• Jika semua dokumen sudah dicetak dan sudah ditandatangani, amplopnya dapat dikirim besok pagi.

But the original sounds very natural in ordinary office or daily communication.

Yes, depending on context, kalau can feel like either if or when.

Why? Because in real usage, the speaker may treat the condition as:

• a true uncertainty: if
• an expected future situation: when

So this sentence could feel like:

• If all the documents have been printed and signed, just send the envelope tomorrow morning. or
• When all the documents have been printed and signed, just send the envelope tomorrow morning.

English often forces you to choose more clearly than Indonesian does. Here, Indonesian leaves that distinction more open.