Saya menutup jendela supaya nyamuk tidak masuk ke kamar.

Tutup is the root word. Menutup is the active verb form made with the meN- prefix.

In a normal declarative sentence, Indonesian usually uses the prefixed form:

• Saya menutup jendela = I close the window

Without the prefix, tutup is more likely to sound like:

• an imperative: Tutup jendela! = Close the window!
• a very informal shortened form
• or just the base dictionary form

So menutup is the standard choice here.

Supaya means so that, in order that, or so in the sense of purpose.

So the structure is:

• Saya menutup jendela = I close the window
• supaya nyamuk tidak masuk ke kamar = so that mosquitoes do not enter the room

It introduces the reason or purpose for the action.

Very similar alternatives are:

• agar — often a bit more formal
• biar — often more colloquial, depending on context

Yes. Agar and supaya are both very common and both work here.

• Saya menutup jendela agar nyamuk tidak masuk ke kamar.
• Saya menutup jendela supaya nyamuk tidak masuk ke kamar.

Both are natural. In many situations, the difference is small:

• agar can sound a little more formal or written
• supaya is very common in everyday speech and writing

Because tidak negates verbs and adjectives, while bukan usually negates nouns, noun phrases, or identity/classification.

Here, masuk is a verb: to enter / to go in.

So:

• tidak masuk = do not enter / not entering

Compare:

• Dia tidak masuk. = He/She does not enter / is not coming in.
• Itu bukan kamar saya. = That is not my room.

So tidak is the correct negator here.

Ke marks movement toward a place, similar to to or into.

• masuk ke kamar = enter the room / go into the room

This is different from di, which marks location:

• di kamar = in the room

So:

• nyamuk masuk ke kamar = mosquitoes go into the room
• nyamuk di kamar = mosquitoes are in the room

That is why ke is used here.

Sometimes yes, especially in casual speech. Indonesian often allows some prepositions to be dropped in informal usage.

So you may hear:

• masuk kamar

But masuk ke kamar is clearer and more standard, especially for learners. It is a good form to use.

If you want to be even more explicit, you could also say:

• masuk ke dalam kamar = enter into the room

That adds extra emphasis on movement inward, but it is not necessary here.

It can be either singular or plural. Indonesian nouns usually do not change form for number.

So nyamuk can mean:

• a mosquito
• mosquitoes

Context tells you which is meant. In this sentence, the general meaning is plural: mosquitoes in general.

If you really want to emphasize plurality, you could say:

• nyamuk-nyamuk

But that is not necessary here. Nyamuk alone is perfectly natural.

It can be omitted if the subject is already clear from context, but including it is very normal and often helpful.

• Saya menutup jendela ... = explicit and clear
• Menutup jendela ... = possible in context, but less complete as a standalone sentence

Also, saya is the polite/neutral word for I. In more informal speech, someone might use aku instead:

• Aku menutup jendela supaya nyamuk tidak masuk ke kamar.

So saya is a good standard choice.

Indonesian verbs do not change form for tense the way English verbs do. Menutup itself does not tell you whether the action is present, past, or future.

So this sentence could mean different things depending on context:

• I close the window so that mosquitoes do not enter the room
• I am closing the window so that mosquitoes do not enter the room
• I closed the window so that mosquitoes would not enter the room

Time is usually shown by context or time words, such as:

• tadi = earlier / a while ago
• sedang = in the process of
• akan = will / going to

For example:

• Saya sedang menutup jendela ... = I am closing the window ...
• Saya tadi menutup jendela ... = I closed the window earlier ...

Because Indonesian does not have articles like English a, an, and the.

So:

• jendela can mean a window or the window
• kamar can mean a room or the room

The exact meaning depends on context.

That is why jendela and kamar appear without any article word.

Both are possible, but they mean slightly different things.

• jendela = window / the window, depending on context
• jendelanya = the window / his-her-their window / that window, depending on context

In this sentence, jendela is enough if the listener already understands which window is meant, or if the sentence is speaking generally.

If you say:

• Saya menutup jendelanya ...

that sounds more specifically like I close the window or I close his/her/the window, with stronger definiteness from context.

So the version with plain jendela is simple and natural.

Because menutup jendela is the normal way to say close the window.

The verb menutup simply means to close / shut something.

Menutupi is a different form with -i, and it often shifts the meaning toward things like:

• covering something over
• closing up a surface or area
• doing the action with a different focus

For a window, the everyday expression is:

• menutup jendela

So learners should treat that as the standard pattern.

This follows normal Indonesian word order quite closely:

• supaya = so that
• nyamuk = mosquitoes
• tidak = not
• masuk = enter
• ke kamar = into the room

So the basic pattern is:

purpose word + subject + negation + verb + destination

That is a very normal Indonesian structure. In many cases, Indonesian word order is fairly similar to English here:

• so that mosquitoes do not enter the room

Not exactly. Kamar usually refers to a room in the sense of a more enclosed, functional room, especially:

• bedroom
• private room
• small room

For a more general room in a house or building, Indonesian also often uses ruangan or specific room names.

But in everyday speech, kamar is very common, and in this sentence it naturally suggests a room someone wants to keep mosquitoes out of, often a bedroom.

So it is a very natural word choice here.