Saya menyetrika seragam sekolah malam sebelumnya.

Menyetrika is the normal active verb form meaning to iron something.

The base word is setrika. When the prefix meN- is added to a root beginning with s, the s usually disappears and the prefix becomes meny-:

• setrika → menyetrika

So saya menyetrika seragam sekolah means I ironed / was ironing the school uniform, depending on context.

Indonesian verbs do not change form for tense the way English verbs do. Menyetrika itself does not mean past, present, or future.

The past meaning comes from the time expression malam sebelumnya. That phrase tells you the action happened earlier.

So in Indonesian, time is often shown by:

• time words, such as kemarin, tadi malam, besok
• context

Sebelumnya means previously, before that, or the previous one/time, depending on context.

It comes from:

• sebelum = before
• -nya = a very common ending that can make the reference more specific or point back to something already understood

In malam sebelumnya, it gives the sense of the previous night or the night before.

Not exactly.

Malam sebelumnya usually means the previous night relative to some reference point. It often sounds like there is another event or time already being discussed.

For a simple last night from the speaker’s current point of view, Indonesian more commonly uses:

• tadi malam
• sometimes semalam

So this sentence is natural if the context is something like a story:

• Paginya saya bangun kesiangan. Saya menyetrika seragam sekolah malam sebelumnya.

If you simply want to say I ironed the school uniform last night, tadi malam is often more natural.

Indonesian often uses time expressions without a preposition.

So malam sebelumnya is completely normal by itself.

You can add pada in more formal or careful language:

• Saya menyetrika seragam sekolah pada malam sebelumnya.

But in everyday Indonesian, leaving it out is very common.

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

So:

• seragam = uniform
• sekolah = school

Together:

• seragam sekolah = school uniform

This is a very common pattern in Indonesian noun phrases.

In a way, yes, but grammatically it is still a noun.

Indonesian often uses one noun to modify another noun:

• seragam sekolah = school uniform
• guru bahasa = language teacher
• buku pelajaran = textbook

So sekolah is not an adjective form like in English; it is a noun being used as a modifier after the main noun.

Indonesian does not have articles like a, an, or the.

Whether something is definite or indefinite is usually understood from context.

So seragam sekolah can mean:

• a school uniform
• the school uniform
• sometimes just school uniform in a general sense

The exact meaning depends on the situation.

Yes, sometimes.

Indonesian often drops pronouns when the subject is already clear from context, especially in casual speech. But keeping saya is perfectly normal, and it makes the sentence clear and complete.

So both can work, depending on context:

• Saya menyetrika seragam sekolah malam sebelumnya.
• Menyetrika seragam sekolah malam sebelumnya.
  This would need context so the listener knows who did it.

Yes.

Indonesian word order is fairly flexible with time expressions. You can say:

• Saya menyetrika seragam sekolah malam sebelumnya.
• Malam sebelumnya, saya menyetrika seragam sekolah.

Both are grammatical. Putting malam sebelumnya first gives more focus to the time. Putting it at the end feels more neutral.