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bihaenggireul tal ttae yeogwoneul kkok chaenggiseyo.

비행기를 탈 때 여권을 꼭 챙기세요.bihaenggireul tal ttae yeogwoneul kkok chaenggiseyo.
Be sure to bring your passport when you board a plane.
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Questions & Answers about bihaenggireul tal ttae yeogwoneul kkok chaenggiseyo.

What does -을 때 mean in 탈 때?

-을/ㄹ 때 means when / at the time of doing (something).
So 비행기를 탈 때 = when you take/get on a plane (i.e., when you’re about to board / when traveling by plane).

Why is it 비행기를 with -를? Can it be omitted?

비행기 is the object of 타다 (to ride/take), so it often takes the object particle -을/를 → 비행기를 타다.
In casual speech, -을/를 is sometimes omitted: 비행기 탈 때 also sounds natural, especially in conversation or shorter notices.

Does 비행기를 타다 mean “to fly an airplane” or “to get on an airplane”?

In Korean, 비행기를 타다 normally means to take/ride a plane (to board and travel by plane), not to pilot it.
To say fly (pilot) an airplane, you’d use something like 비행기를 조종하다.

What nuance does 꼭 add?

꼭 means for sure / 꼭 = definitely / 꼭 = 꼭 빠뜨리지 말고.
It adds emphasis: Make sure you bring it / Don’t forget it. It’s stronger than just saying 여권을 챙기세요.

What does 챙기세요 mean exactly—“pack,” “bring,” or “check”?

챙기다 is a very common verb meaning to take care to prepare and bring something you might forget.
Depending on context, it can be pack it, bring it with you, or make sure you have it. Here it’s: Make sure you have/bring your passport.

Why is the verb ending -세요 used?

-세요 is a polite request/imperative ending.
It’s appropriate for general advice, signs, announcements, or speaking politely to someone you don’t know well. It’s less forceful than a command in plain form, but still tells the listener what to do.

Is this sentence a command or a suggestion?

Grammatically it’s an imperative/request (telling someone to do something), but pragmatically it often functions like advice/reminder, especially with travel situations: Please make sure to bring your passport when flying.

Why is it 여권을 (object particle) and not 여권이/여권은?

Because 여권 is the object of 챙기다 (to pack/bring/make sure to take), it takes -을/를 → 여권을 챙기세요.
If you used 여권은, it would sound like As for your passport, (make sure...)—a topic/contrast nuance. 여권이 would not fit well here because the passport isn’t the subject of the action.

Could the order be changed, like 여권을 꼭 비행기를 탈 때 챙기세요?

Yes. Korean word order is flexible.

  • 비행기를 탈 때 여권을 꼭 챙기세요 (natural, common)
  • 여권을 꼭 비행기를 탈 때 챙기세요 (also possible; stresses passport)
    As long as the particles are clear, you can move parts for emphasis.
What’s the difference between 비행기를 탈 때 and 비행기 탈 때?

They mean the same here.

  • 비행기를 탈 때 = more explicit/standard (object marked)
  • 비행기 탈 때 = more compact, very common in speech/writing like notices
Can 탈 때 mean “while on the plane” rather than “when boarding”?

-을 때 can cover a range: when doing / when you do / while doing.
But with 비행기를 타다, 비행기를 탈 때 usually means when you’re going to take a plane / when boarding or traveling by plane. If you want clearly while on the plane, you might say 비행기 안에서 (on/in the plane) or 비행기를 타고 있는 동안에 (while you’re on the plane).

How would you make it more formal or more casual?

Common variations:

  • More formal (announcements): 비행기 탑승 시 여권을 반드시 지참하시기 바랍니다.
  • Polite casual: 비행기 탈 때 여권 꼭 챙기세요.
  • Casual to a friend: 비행기 탈 때 여권 꼭 챙겨.