Plester itu sudah diratakan.

Plester can mean a few different things in Indonesian, depending on context:

• plaster / wall plaster / render in construction
• bandage / adhesive plaster in medical contexts

In Plester itu sudah diratakan, the most natural meaning is the plaster on a wall or surface, because diratakan means made flat / smoothed / leveled.

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

So:

• plester itu = that plaster / the plaster

This is different from English, where that comes before the noun.

Sudah means already or shows that something is completed.

So sudah diratakan means:

• has already been smoothed
• has been leveled
• is already flattened

It tells you the action is not just happening — it is done.

The prefix di- usually marks the passive voice in Indonesian.

So:

• meratakan = to level / to smooth / to flatten
• diratakan = to be leveled / to be smoothed / to be flattened

The sentence focuses on the plaster as the thing affected by the action, not on the person who did it.

So the structure is like:

• Plester itu = the plaster
• sudah diratakan = has already been smoothed

The base is rata, which means:

• flat
• even
• level

From that:

• meratakan = to make something flat/even
• diratakan = to be made flat/even

The suffix -kan helps turn rata into a verb meaning to make something become flat or even.

It can mean all of those, depending on context.

Common possibilities are:

• flattened
• leveled
• smoothed out
• made even

With plaster, English translations like smoothed or leveled are often the most natural.

Indonesian often leaves out the doer when it is:

• unknown
• obvious
• unimportant
• less important than the result

So Plester itu sudah diratakan simply means the plaster has been smoothed, without saying who did it.

If you want to mention the doer, you can add oleh:

• Plester itu sudah diratakan oleh pekerja.
• The plaster has already been smoothed by the worker(s).

Not exactly.

Plester itu sudah diratakan means there was an action of making it flat.

If you just want to describe its current state, you would more naturally say something like:

• Plester itu sudah rata.

So:

• sudah rata = it is already flat
• sudah diratakan = it has already been flattened/smoothed

The second one emphasizes that someone did something to it.

Both can mark completion, so both of these are possible:

• Plester itu sudah diratakan.
• Plester itu telah diratakan.

The difference is mainly style:

• sudah = more common in everyday speech
• telah = more formal, often used in writing or formal announcements

In ordinary conversation, sudah is usually more natural.

Indonesian and English organize this idea a bit differently.

Word by word:

• Plester itu = that/the plaster
• sudah = already
• diratakan = has been leveled/smoothed

Natural English translations include:

• The plaster has already been smoothed.
• That plaster has already been leveled.
• The plaster is already smoothed out.

The best translation depends on the situation, but the core idea is that the plaster has already undergone the action of being made flat.