Trước khi đến sân bay, tôi luôn xem lại hộ chiếu và hành lý.

Trước khi means before. It introduces a time clause.

In this sentence:

• Trước khi đến sân bay = Before arriving at the airport / Before going to the airport

A very common pattern is:

• trước khi + verb
• sau khi + verb

Examples:

• Trước khi ngủ, tôi đọc sách. = Before sleeping, I read.
• Sau khi ăn, tôi uống trà. = After eating, I drink tea.

In Vietnamese, the subject is often omitted when it is already clear from context.

Here, the main clause is:

• tôi luôn xem lại hộ chiếu và hành lý = I always check my passport and luggage again

Because tôi appears in the main clause, Vietnamese naturally understands that the same person is also the one đến sân bay.

So:

• Trước khi đến sân bay, tôi... literally looks like Before arriving at the airport, I...
• The subject I is understood in both parts.

If needed, you could make it more explicit, but native Vietnamese often leaves it out.

Yes, đến often means to arrive or to come to/reach a place.

In this sentence, đến sân bay can naturally be understood as:

• arrive at the airport
• or more loosely go to the airport

Vietnamese often uses đến + place where English might choose either go to or arrive at, depending on context.

So:

• đến sân bay = arrive at the airport / get to the airport

If the situation is specifically about the action of going somewhere, learners may expect đi đến, but in everyday Vietnamese, đến sân bay is very natural.

Luôn means always.

In this sentence:

• tôi luôn xem lại... = I always check again...

It usually goes before the main verb:

• tôi luôn ăn sáng = I always eat breakfast
• cô ấy luôn đến sớm = she always arrives early

So the pattern is often:

• subject + luôn + verb

Xem means to look at, to check, or to watch, depending on context.

Xem lại adds the idea of again, back over, or review/check once more.

So:

• xem = look at / check
• xem lại = check again / review / re-check

In this sentence:

• xem lại hộ chiếu và hành lý = check my passport and luggage again / double-check my passport and luggage

The word lại is very common in Vietnamese for the sense of doing something again.

Very often, yes, but not always in a simple one-word way.

In xem lại, it means again or once more.

However, lại can also have other uses depending on context, such as:

• repetition: làm lại = do again
• return: quay lại = come/go back
• contrast or unexpected development in some structures

Here, the meaning is straightforward:

• xem lại = check again

Vietnamese often leaves out possessive words like my when the meaning is obvious.

So:

• hộ chiếu = passport
• hành lý = luggage

In context, because the subject is tôi and people normally check their own passport and luggage, Vietnamese does not need to say của tôi.

English usually prefers:

• my passport and luggage

But Vietnamese naturally says:

• hộ chiếu và hành lý

If you want to be explicit, you can say:

• hộ chiếu và hành lý của tôi

That is correct, but it may sound a little more specific or emphatic than necessary in this context.

Hành lý means luggage, baggage, or bags/belongings for travel.

Like English luggage, it often behaves like a mass or collective noun rather than a clearly singular/plural count noun.

So:

• hành lý can mean your luggage in general
• it does not need a plural ending

If you want to count pieces of luggage, Vietnamese usually adds a classifier or counting word, for example:

• hai kiện hành lý = two pieces of luggage

In this sentence, hành lý simply means luggage/baggage in general.

The comma separates the time clause from the main clause.

Structure:

• Trước khi đến sân bay, = Before arriving at the airport,
• tôi luôn xem lại hộ chiếu và hành lý. = I always check my passport and luggage again.

This is similar to English, where a comma is often used after an introductory phrase:

• Before going to the airport, I always check my passport and luggage.

In Vietnamese writing, this comma is very natural and helps readability.

Yes. Vietnamese can often place the time phrase at the beginning or end.

Original:

• Trước khi đến sân bay, tôi luôn xem lại hộ chiếu và hành lý.

Possible rearrangement:

• Tôi luôn xem lại hộ chiếu và hành lý trước khi đến sân bay.

Both are correct. The version with trước khi... at the beginning puts more focus on the time setting: before going to the airport.

Yes, historically it is made of:

• sân = yard, ground, court, field-like open area
• bay = fly

So sân bay literally suggests a flying ground/airfield, but as a normal vocabulary item it simply means airport.

Learners do not need to over-analyze it every time. Just remember:

• sân bay = airport

Yes. In natural English, Before going to the airport, I always check my passport and luggage is probably the most practical translation.

Even though đến often points to arriving/reaching, translations should match normal English usage and context. Since you usually check your passport and luggage before leaving for the airport, before going to the airport sounds very natural.

So both are possible, but:

• Before going to the airport... = more natural in everyday English
• Before arriving at the airport... = closer to the Vietnamese wording

Yes, very much so. It uses a very common structure:

• Trước khi + verb/clause, subject + time word + verb + object

In this sentence:

• Trước khi đến sân bay, = Before arriving at the airport,
• tôi = I
• luôn = always
• xem lại = check again
• hộ chiếu và hành lý = passport and luggage

You can reuse this pattern easily:

• Trước khi ra ngoài, tôi luôn khóa cửa. = Before going out, I always lock the door.
• Trước khi học, cô ấy luôn uống cà phê. = Before studying, she always drinks coffee.
• Trước khi đi ngủ, tôi luôn tắt đèn. = Before going to bed, I always turn off the light.