chulbalhagi jeone yeogwoneul dasi hwaginhae bwayo.

-기 전에 means before doing something.

• Base verb: 출발하다 = to depart / to leave
• Verb stem: 출발하-
• -기 turns the action into a noun-like form
• 전에 means before

So 출발하기 전에 literally means before departing or before you leave.

This is a very common pattern:

• 먹기 전에 = before eating
• 자기 전에 = before sleeping
• 가기 전에 = before going

Yes. 출발 전에 is also natural.

That is possible because 출발 can work as a noun meaning departure. So:

• 출발 전에 = before departure
• 출발하기 전에 = before departing

In many situations, both are fine. 출발하기 전에 feels a bit more clearly verbal, because it focuses on the action of leaving.

Because 여권 is the direct object of 확인하다.

You are checking the passport, so Korean uses the object particle 을/를:

• 여권을 확인하다 = to check the passport

If you used 여권은, it would sound like you are making passport the topic or contrasting it with something else:

• 여권은 확인해 봐요 = As for the passport, check it / at least check the passport

So 여권을 is the neutral, normal choice here.

다시 means again, once more, or over again.

In this sentence, it gives the idea of checking the passport one more time before leaving. It often has a practical nuance like:

• just to be safe
• take another look
• re-check

So it does not only mean repeating an action mechanically; it often implies a useful double-check.

Here, 보다 is not being used in its basic literal sense of to see.

The pattern -아/어 보다 means:

• to try doing
• to do and see what happens
• sometimes more naturally in English, to check, to have a look, or to give it a try

So:

• 확인해요 = check / confirm
• 확인해 봐요 = try checking / check it over / have a look and confirm

In this sentence, 확인해 봐요 sounds softer and more natural than a plain 확인해요. It feels like a polite suggestion or gentle instruction.

Because 확인하다 is a 하다 verb.

When 하다 conjugates before endings like -아/어, it becomes 해:

• 확인하다 → 확인해
• 공부하다 → 공부해
• 준비하다 → 준비해

So the sentence is built like this:

• 확인하다
• 확인해 보다
• 확인해 봐요

That change from 하다 to 해 is completely regular.

It is most naturally understood as a polite suggestion or gentle instruction.

Because of -아/어 봐요, the tone is softer than a direct command. Depending on context, it can feel like:

• Please check your passport again before leaving
• Let’s check the passport again before leaving
• You should check the passport again before leaving

In real use, context and intonation decide the exact feel. But for learners, the safest interpretation is polite advice/request.

Both are possible, but they have slightly different tones.

• 확인해 봐요 = softer, more conversational
• 확인해 보세요 = more clearly directed to the listener, often more polite/respectful

So:

• 여권을 다시 확인해 봐요 can sound like friendly advice
• 여권을 다시 확인해 보세요 sounds more like polite guidance or instruction

If you are speaking to someone you should show extra respect to, -보세요 is often the safer choice.

Because 보다 here is functioning as an auxiliary verb in the pattern -아/어 보다.

In careful standard writing, this is often spaced as:

• 확인해 봐요

You may also see 확인해봐요 in everyday writing, but textbooks and formal grammar explanations often show it separated to make the structure clearer.

So for studying, 확인해 봐요 is a very good form to remember.

Yes, but the nuance changes.

• 확인해 봐요 = try checking / have a look; soft suggestion
• 확인하세요 = check it; more direct instruction
• 확인해 주세요 = please check it; polite request
• 확인해 보세요 = please try checking / please check it over; polite and natural

So the original sentence is nice because it sounds gentle and practical, not too abrupt.