beoseureul tal ttaeneun gyotongkadeu janaegeul miri hwaginhagon hae.

In Korean, 타다 for riding/getting on a vehicle usually takes a direct object, so the vehicle is marked with 을/를:

• 버스를 타다 = to ride/take the bus
• 지하철을 타다 = to take the subway
• 택시를 타다 = to take a taxi

This is different from English, where we often think of getting on something.

So in 버스를 탈 때는, the bus is the object of 타다, which is why 버스를 is correct.

This is because -ㄹ 때 attaches to the verb stem and means when or at the time of doing something.

• dictionary form: 타다
• stem: 타-
• • -ㄹ 때 → 탈 때

So:

• 버스를 탈 때 = when (I) take the bus / when riding the bus

This is a very common pattern:

• 먹다 → 먹을 때 = when eating
• 가다 → 갈 때 = when going
• 공부하다 → 공부할 때 = when studying

The 는 is a topic marker. It adds a nuance like:

• as for when I take the bus...
• when it comes to taking the bus...

So:

• 버스를 탈 때 = when taking the bus
• 버스를 탈 때는 = as for when taking the bus / when I take the bus, ...

It often sets up a contrast or frames the situation. Even if there is no explicit contrast in English, Korean often uses 는 naturally in sentences like this.

A subtle implied contrast could be:

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해.
  = When I take the bus, I tend to check my transit card balance in advance.
  (Maybe not necessarily in other situations.)

교통카드 means transportation card or transit card—the card used to pay for buses and subways in Korea.

Breakdown:

• 교통 = transportation, traffic
• 카드 = card

So 교통카드 is the standard word for things like a rechargeable bus/subway fare card.

잔액 means remaining balance.

So:

• 교통카드 잔액 = the remaining balance on a transit card

This is a very common word for money left in an account, card, or balance system.

Examples:

• 계좌 잔액 = account balance
• 잔액이 부족해요 = The balance is insufficient.
• 잔액을 확인하다 = to check the balance

In this sentence, it specifically means checking how much money is left on the transit card before getting on the bus.

In Korean, 의 often gets omitted when one noun naturally modifies another noun.

So both are possible:

• 교통카드 잔액
• 교통카드의 잔액

But the version without 의 is usually more natural and common in everyday Korean.

This kind of noun-noun combination is very common:

• 학교 이름 = school name
• 한국 음식 = Korean food
• 회사 직원 = company employee

So 교통카드 잔액 simply means transit card balance.

미리 means in advance, beforehand, or ahead of time.

So 미리 확인하다 means:

• to check in advance
• to check beforehand

In this sentence, it shows that the speaker checks the balance before boarding, so they do not run into problems later.

Examples:

• 미리 예약했어요. = I booked in advance.
• 미리 준비하세요. = Prepare beforehand.
• 미리 말해 줘. = Tell me ahead of time.

확인하곤 해 adds the nuance of a habitual action—something the speaker tends to do, often does, or does as a habit.

The grammar here is -곤 하다, which is used for repeated or customary behavior.

So:

• 확인해 = I check / I’m checking
• 확인하곤 해 = I often check / I tend to check / I habitually check

In this sentence, the speaker is not talking about a one-time action. They are describing a routine:

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해. = When I take the bus, I tend to check my transit card balance in advance.

This is one of the most important nuances in the sentence.

Not exactly.

-곤 하다 usually emphasizes a repeated habit or something one would often do.

• 확인하곤 해 = I often/tend to check

-기도 하다 is broader and often means sometimes do or also do, depending on context.

Compare:

• 운동하곤 해. = I work out regularly / I tend to work out.
• 운동하기도 해. = I also work out / I sometimes work out.

So in this sentence, -곤 해 is a better fit because the speaker is talking about a routine behavior associated with taking the bus.

해 is the casual, non-polite style.

The full sentence is in informal speech:

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해.

A more polite version would be:

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해요.

And a more formal/written style could be:

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 합니다.

So the original sentence sounds like something you might say to a friend or in casual conversation.

The subject is understood from context, and it is most naturally I here.

Korean often omits subjects when they are obvious. So this sentence is naturally understood as:

• (나는) 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해.

In English, you usually need to say I, but in Korean it is often unnecessary.

This omission is extremely common, especially in casual speech.

Yes, depending on context, 버스를 탈 때 can cover both ideas broadly:

• when taking the bus
• when riding the bus
• when getting on the bus

In this sentence, because the speaker checks the card balance 미리 (in advance), the intended sense is closer to:

• before / when I’m about to take the bus

So it is not just describing being physically on the bus; it refers to the situation of using the bus as transportation.

Yes, but the nuance would change.

• 버스를 탈 때는 교통카드 잔액을 확인하곤 해.
  = When I take the bus, I tend to check my transit card balance.

• 버스를 탈 때는 교통카드 잔액을 미리 확인하곤 해.
  = When I take the bus, I tend to check my transit card balance in advance.

With 미리, the sentence emphasizes preparation and foresight. Without it, the sentence still makes sense, but it loses the idea of checking beforehand.

Yes, it sounds very natural.

It uses several very common patterns:

• -ㄹ 때는 for when/as for when
• noun + 잔액 for balance
• 미리 확인하다 for check in advance
• -곤 하다 for habitual behavior

So this is the kind of sentence a native speaker could naturally say in daily conversation, especially when talking about routines or practical habits.