Petugas di loket berkata bahwa formulir itu belum sah tanpa stempel.

Petugas means something like staff member, officer, attendant, or clerk, depending on context.

In this sentence, petugas di loket is most naturally the clerk/staff member at the counter.

A useful thing to know is that petugas is a fairly general word. It does not automatically mean a police officer or government official; it can refer to any person on duty.

Loket usually means a service counter, ticket window, or booth.

So di loket means at the counter/window.

This word is often used in places like:

• stations
• banks
• offices
• government service desks
• ticket counters

Di is a preposition meaning in, at, or on for location.

So:

• di loket = at the counter
• di kantor = at the office
• di rumah = at home

Here it marks where the staff member was: at the counter.

A learner should also remember that di as a preposition is written separately:

• di loket = correct

This is different from the prefix di- used in passive verbs, which is written together:

• ditulis = written

Yes. Both berkata bahwa and mengatakan bahwa can work here.

Roughly:

• berkata = to say / to speak
• mengatakan = to say / to state / to tell

In many contexts, mengatakan sounds a bit more natural before a full clause:

• Petugas itu mengatakan bahwa...

But berkata bahwa... is also acceptable and understandable.

A small difference:

• berkata often focuses more on the act of speaking
• mengatakan often focuses more on the content being said

Bahwa means that and introduces a clause.

So:

• berkata bahwa formulir itu belum sah... = said that the form was not yet valid...

Just like English that, bahwa can sometimes be omitted, especially in less formal speech:

• Petugas di loket berkata formulir itu belum sah tanpa stempel.

But keeping bahwa makes the structure clearer, and it often sounds more formal or careful.

In Indonesian, demonstratives like ini and itu usually come after the noun.

So:

• formulir itu = that form
• buku ini = this book
• rumah itu = that house

This is the normal pattern:

• noun + ini/itu

So formulir itu is exactly what you would expect.

Literally, itu means that. But in real Indonesian, it can also make a noun sound more definite, a bit like English the, depending on context.

So formulir itu can mean:

• that form
• the form (if both speaker and listener already know which form)

In this sentence, the exact English translation depends on context. Indonesian does not use articles the same way English does.

This is an important distinction.

• belum sah = not valid yet
• tidak sah = not valid / invalid

Belum suggests that the situation may change later. The form is not valid now, but it could become valid after something happens, such as getting a stamp.

That fits this sentence very well:

• without the stamp, the form is not yet valid

If you said tidak sah, it would sound more final: simply invalid.

Sah means valid, official, legally valid, or legitimate, depending on context.

For documents, forms, approvals, and procedures, sah often means:

• officially accepted
• legally valid
• properly authorized

So belum sah here means the form is not officially valid yet.

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

So:

• Formulir itu belum sah literally looks like:
• That form not-yet valid

But the natural English translation is:

• That form is not yet valid

This is very common in Indonesian:

• Dia guru = She is a teacher
• Rumahnya besar = His/Her house is big
• Dokumen ini penting = This document is important

Tanpa means without, and stempel means stamp.

So:

• tanpa stempel = without a stamp / without the stamp

As with formulir itu, English may need a or the, but Indonesian does not use articles in the same way.

Here the meaning is that the stamp is required for the form to be considered valid.

Usually, yes. Stempel often refers to a physical stamp, especially an office or administrative stamp placed on a document.

Depending on context, English might translate it as:

• stamp
• official stamp
• seal

In everyday Indonesian, stempel is a very common word for the kind of mark an office puts on paperwork.

Yes, some parts could be rearranged, but the original order is natural.

For example:

• Petugas di loket berkata bahwa formulir itu belum sah tanpa stempel.

You could also say:

• Petugas di loket mengatakan bahwa formulir itu belum sah tanpa stempel.

Or front the location for emphasis:

• Di loket, petugas berkata bahwa formulir itu belum sah tanpa stempel.

But the original sentence is straightforward and standard:

1. who spoke
2. where they were
3. what they said

In meaning, it modifies the whole idea of validity: the form is not valid without a stamp.

So the sense is:

• The form is not yet valid if it does not have a stamp

It is not really saying the form itself is inherently a without-stamp form. It is saying that the absence of the stamp prevents validity.

If you wanted to make that relationship even more explicit, Indonesian could say:

• Formulir itu belum sah kalau belum ada stempel.
• Formulir itu belum sah jika tidak ada stempel.

But the original wording is perfectly normal.

It sounds neutral to slightly formal.

Why?

• petugas is a neutral/formal word
• loket is common administrative vocabulary
• bahwa often gives a slightly more formal feel
• belum sah sounds official or bureaucratic

So this is the kind of sentence you might hear in an office, government building, hospital, or ticketing situation.