يبدأ المؤتمر اليوم.

In careful MSA with full endings, it is:

يبدأُ المؤتمرُ اليومَ

A common transliteration is yabdaʾu al-muʾtamaru al-yawma.

A rough pronunciation guide:

• يبدأ = yab-da-u (with a glottal stop before the last vowel)
• المؤتمر = al-muʾ-ta-mar
• اليوم = al-yawm

Two useful pronunciation notes:

• The ء (hamza) is a real consonant: a short catch in the throat.
• In المؤتمر, the ال is pronounced clearly because م is a moon letter, not a sun letter.

يبدأ is a present/imperfect verb, third person, masculine, singular.

It means he begins or it begins, depending on the subject.

Here the subject is المؤتمر (the conference), which is masculine singular, so يبدأ means:

• it begins
• more naturally in English: the conference begins

Its root is ب د أ, which carries the idea of beginning or starting.

Because Arabic often uses verb–subject–object/complement order, especially in formal written language like MSA.

So:

• يبدأ المؤتمر اليوم = The conference begins today

This verb-first order is very normal.

You can also say:

• المؤتمر يبدأ اليوم

That is also correct, but it puts more focus on the conference as the topic.

Because المؤتمر is a masculine singular noun.

In Arabic, the verb agrees with the subject in gender, so:

• masculine singular subject → يبدأ
• feminine singular subject → تبدأ

For example:

• تبدأ المحاضرة اليوم = The lecture begins today

So in your sentence, يبدأ is used because المؤتمر is masculine.

In full vowel marking, the sentence is:

يبدأُ المؤتمرُ اليومَ

Here is what is happening:

• يبدأُ: ends in ـُ because it is in the normal indicative form
• المؤتمرُ: ends in ـُ because it is the subject and therefore nominative
• اليومَ: ends in ـَ because it is being used adverbially as a time expression (today)

In everyday Arabic writing, these short endings are usually not written.

اليوم means today, and here it functions as an adverb of time.

In Arabic grammar, this is often treated as a ظرف زمان (adverbial expression of time).

So it tells you when the action happens:

• يبدأ المؤتمر اليوم = The conference begins today

Even though اليوم literally contains الـ, it is very commonly used as the time adverb today.

It can suggest either, depending on context.

The Arabic imperfect often covers meanings that English splits into:

• begins
• is beginning
• sometimes even a scheduled future like starts

With اليوم, this sentence is most naturally understood as something like:

• The conference begins today
• The conference starts today

So it often feels like a scheduled present/near-future event.

Because Arabic does not need an auxiliary verb here.

English often uses helpers like:

• is beginning
• does begin

But Arabic can express the idea with just the main verb:

• يبدأ = begins / is beginning

So the sentence is complete without any extra word for is or does.

Yes. Arabic allows some flexibility in word order.

For example:

• يبدأ المؤتمر اليوم
• المؤتمر يبدأ اليوم
• اليوم يبدأ المؤتمر

All of these can mean The conference begins today, but the emphasis changes:

• يبدأ المؤتمر اليوم: neutral, standard formal style
• المؤتمر يبدأ اليوم: emphasis on the conference
• اليوم يبدأ المؤتمر: emphasis on today

So the basic meaning stays the same, but the focus shifts.

Because it has الـ, the Arabic definite article, so مؤتمر becomes المؤتمر = the conference.

Without الـ, مؤتمر would mean a conference.

So compare:

• يبدأ مؤتمرٌ اليوم = A conference begins today
• يبدأ المؤتمر اليوم = The conference begins today

In your sentence, the speaker is talking about a specific conference.

A simple MSA negation is:

لا يبدأ المؤتمر اليوم

This means:

• The conference does not begin today
• The conference isn’t starting today

Here لا is placed before the present/imperfect verb يبدأ.

Both words contain a hamza (ء), and that matters for both spelling and pronunciation.

• يبدأ has the hamza at the end of the root
• المؤتمر also contains a hamza: مؤ

In pronunciation, hamza is a brief glottal stop, like a tiny break in the voice.

So:

• يبدأ is not just yabda; it is more like yabdaʾu
• المؤتمر is not just al-mutamar; it is al-muʾtamar

This is an important sound in MSA and worth practicing early.