Begitu rapat dimulai, saya menaruh ponsel di dalam tas supaya tidak mengganggu.

Here begitu means as soon as or once.

So Begitu rapat dimulai means As soon as the meeting started / starts.

A few useful comparisons:

• begitu = as soon as, once
• ketika = when
• saat = when, at the time

In this sentence, begitu gives a stronger sense of immediacy: the phone was put away right at the start of the meeting.

Dimulai is the passive form of memulai = to start something.

• memulai rapat = to start the meeting
• rapat dimulai = the meeting is started / the meeting begins

In natural English, we usually translate rapat dimulai simply as the meeting begins/began, even though Indonesian is using a passive-style form.

Rapat mulai is sometimes heard in casual speech, but rapat dimulai is more standard and polished.

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

Compare:

• Ketua memulai rapat. = The chairperson starts the meeting.
• Rapat dimulai. = The meeting is started / The meeting begins.

In this sentence, the doer is not important. The focus is on the meeting itself, not on who started it.

Also note that di- here is a prefix and must be written together with the verb:

• dimulai ✔
• di mulai ✘

Indonesian verbs do not normally show tense the way English verbs do. So dimulai by itself does not tell you whether it is present, past, or future.

The time is understood from context.

Depending on context, Begitu rapat dimulai could mean:

• As soon as the meeting starts
• As soon as the meeting started
• Once the meeting has started

In your sentence, English would most naturally use either started or began, depending on the wider context.

Menaruh means to put or to place something somewhere.

So:

• saya menaruh ponsel di dalam tas = I put my phone in the bag

It focuses on the act of placing something somewhere.

Related verbs:

• menaruh = put, place
• meletakkan = put, place, set down
• menyimpan = store, keep, put away

In this sentence, menaruh is very natural because the speaker physically places the phone in the bag.

They overlap, but there are slight differences:

• menaruh = to put/place; common and neutral
• meletakkan = to put/place/set down; a bit more formal or deliberate
• menyimpan = to keep/store/put away; emphasizes keeping it somewhere, often safely or for later

Examples:

• Saya menaruh ponsel di tas. = I put the phone in the bag.
• Saya meletakkan ponsel di meja. = I placed the phone on the table.
• Saya menyimpan ponsel di tas. = I put the phone away in the bag / kept it in the bag.

In your sentence, menaruh works well because it describes the immediate action of putting the phone into the bag.

Ponsel means mobile phone or cell phone.

It is common and standard Indonesian. You may also hear:

• HP = very common in everyday speech, from handphone
• telepon genggam = a more formal term

So all of these can refer to a phone, but the style is different:

• ponsel = standard, natural
• HP = very colloquial and extremely common
• telepon genggam = formal

Di dalam tas means inside the bag.

Breakdown:

• di = in, at, on
• dalam = inside
• tas = bag

So di dalam tas emphasizes the location: inside the bag.

Possible alternatives:

• di tas = in/on the bag, less specific
• dalam tas = in the bag; also common, often without di
• ke dalam tas = into the bag, emphasizing movement into it

Because menaruh already implies movement, di dalam tas is perfectly natural here. It focuses on where the phone ended up.

Supaya means so that or in order that.

In this sentence:

• supaya tidak mengganggu = so that it does not disturb / so it won’t be distracting

It introduces a purpose clause: the reason the speaker puts the phone in the bag.

Similar words:

• supaya = so that
• agar = so that; slightly more formal
• biar = so that / let; more colloquial in many contexts

The understood subject is the phone.

So the idea is:

• Saya menaruh ponsel di dalam tas supaya ponsel tidak mengganggu.

But Indonesian often omits words that are already obvious from context. Because ponsel was just mentioned, it does not need to be repeated.

English does something similar sometimes:

• I put my phone in my bag so it wouldn’t be distracting.

Here it refers to my phone, just as the omitted subject in Indonesian does.

Yes, mengganggu often takes an object:

• mengganggu saya = disturb me
• mengganggu rapat = disturb the meeting

But the object can be left unstated if it is obvious.

In this sentence, tidak mengganggu means something like:

• not disturb people
• not disturb the meeting
• not be disruptive

The exact object is not spelled out because the general idea is clear from context.

In this sentence, it most naturally means the phone should not disturb people.

The logic is:

• I put the phone in my bag
• so that it would not disturb anyone / so it would not be a distraction

Because ponsel is the nearest relevant noun, that is the most natural understood subject.

If the speaker wanted to clearly say so that I would not disturb others, they could say something more explicit, such as:

• supaya saya tidak mengganggu orang lain

Yes. The sentence has a very normal structure:

• Begitu rapat dimulai = time clause
• saya menaruh ponsel di dalam tas = main clause
• supaya tidak mengganggu = purpose clause

A rough pattern is:

Time expression + main action + purpose

This is very common in Indonesian.

Yes, but the nuance changes a little.

• Begitu rapat dimulai... = As soon as the meeting started...
• Ketika rapat dimulai... = When the meeting started...
• Saat rapat dimulai... = When the meeting started...

Begitu emphasizes that the action happened immediately at that moment.
Ketika and saat are more neutral.

So if you want the idea of right away, begitu is the best choice.

Yes. That is completely normal in Indonesian.

Indonesian usually does not mark tense directly on the verb. Instead, time comes from:

• context
• time words
• the situation

So this sentence can be understood perfectly without words like already, was, or will.

If needed, time can be made clearer with words such as:

• tadi = earlier
• kemarin = yesterday
• besok = tomorrow
• sudah = already
• akan = will

But in many everyday sentences, Indonesian leaves tense unmarked.

Yes, it sounds natural and appropriate.

Why it sounds good:

• rapat is standard vocabulary for meeting
• ponsel is natural and standard
• menaruh ... di dalam tas is clear and idiomatic
• supaya tidak mengganggu is a polite, considerate reason

It sounds like something someone might say in a workplace or formal setting.