hoeui jeone balpyo jaryoreul dasi hwaginhaeyo.

전에 means before.

In this sentence, 회의 전에 means before the meeting.

A very common pattern is:

• noun + 전에 = before a noun
• verb stem + 기 전에 = before doing something

Examples:

• 회의 전에 = before the meeting
• 먹기 전에 = before eating
• 자기 전에 = before sleeping

So here, 회의 전에 sets the time background for the action.

Because 전에 attaches directly to a noun phrase to mean before X.

So:

• 회의 전에 = before the meeting

You do not normally add 를 or 가 there, because 회의 is not acting as the object or subject of the main verb. It is just part of the time expression.

Think of 회의 전에 as one time unit:

• before the meeting

발표 자료 is a noun phrase made of two nouns:

• 발표 = presentation, announcement
• 자료 = materials, data, documents, reference materials

Together, 발표 자료 means something like:

• presentation materials
• materials for a presentation
• presentation documents
• sometimes even slides, depending on context

Korean often combines nouns like this, so even though it is written as two words, it functions as one idea.

Because 자료 is the direct object of the verb 확인해요.

The sentence is about checking the presentation materials, so:

• 발표 자료를 = the presentation materials + object marker
• 확인해요 = check / confirm

The marker 을/를 shows what is being checked.

Since 자료 ends in a vowel, it takes 를:

• 자료를

다시 usually means again or once more.

So 다시 확인해요 means:

• check again
• review again
• look over once more

In this sentence, it suggests the speaker is re-checking the materials before the meeting.

The dictionary form is 확인하다.

This is a very common noun + 하다 verb:

• 확인 = confirmation, checking
• 하다 = to do

So 확인하다 literally means to do a check/confirmation, and in natural English it becomes:

• to check
• to confirm
• to verify

Its polite present-style form is:

• 확인해요

This comes from:

• 확인하다 → 확인해요

해요 is the polite, non-formal speech style that is very common in everyday Korean.

So 확인해요 is polite and natural in normal conversation.

It is less formal than 확인합니다, but more polite than 확인해.

Compare:

• 확인해 = casual
• 확인해요 = polite everyday speech
• 확인합니다 = formal

Korean word order is usually:

• time expression
• object
• adverbs
• verb at the end

So here:

• 회의 전에 = before the meeting
• 발표 자료를 = the presentation materials
• 다시 = again
• 확인해요 = check

A very literal order would be:

• Before the meeting, the presentation materials again check.

That sounds unnatural in English, but it is normal in Korean because the verb usually comes at the end.

In Korean, the present tense often covers both:

• present habitual actions
• near-future actions
• general statements

So 회의 전에 발표 자료를 다시 확인해요 could mean:

• I check the presentation materials again before the meeting.
• I’m checking the presentation materials again before the meeting.
• I’ll check the presentation materials again before the meeting.

The exact meaning depends on context.

Korean nouns usually do not have to show singular vs. plural.

So 자료 can mean:

• material
• materials

In this sentence, English will usually translate it as materials, because that sounds more natural for presentation-related documents or slides.

Korean sometimes uses 들 for plural, but it is often unnecessary:

• 자료들 = materials

Here, 발표 자료를 is completely natural without any plural marking.

Yes, sometimes you will see 회의 전 instead of 회의 전에.

Both relate to before, but there is a small difference in feel:

• 회의 전 = before the meeting, pre-meeting
• 회의 전에 = before the meeting, at a time before the meeting

In many everyday sentences, both are possible, but 전에 often sounds a little more clearly adverbial, meaning before doing the main action.

So in this sentence, 회의 전에 발표 자료를 다시 확인해요 is very natural.

It could be either.

Without more context, Korean does not force a clear distinction here.

It can mean:

• a habit: I check the presentation materials again before meetings
• a specific plan/action: I’ll check the presentation materials again before the meeting

Context tells you which one is intended.