taeksireul tajamaja anjeonbelteureul kkok maeyo.

타자마자 means as soon as (someone) gets in/rides.

It is made from:

• 타다 = to ride, take, get on/in
• verb stem 타-
• -자마자 = as soon as

So:

• 타다 → 타자마자
• 내리다 → 내리자마자 = as soon as one gets off
• 집에 오다 → 오자마자 = as soon as one comes home

This grammar shows that the second action happens immediately after the first one.

The basic Korean pattern is N을/를 타다 for transportation:

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

So the taxi is treated as the direct object of 타다.

You may also hear forms like 택시에 타다 in contexts that focus more on physically getting into the taxi, but for learners, 택시를 타다 is the standard and most important pattern to know.

It can match several English verbs depending on context.

In this sentence, 택시를 타자마자 is most naturally understood as:

• as soon as I get in a taxi
• or as soon as I take a taxi

Korean often uses one verb, 타다, where English chooses between ride, take, board, or get in.

Because there are really two verb phrases:

1. 택시를 타자마자 = as soon as (I) get in the taxi
2. 안전벨트를 꼭 매요 = (I) definitely fasten the seatbelt

Each verb has its own object:

• 택시를 타다
• 안전벨트를 매다

So having two 를 particles is completely normal here.

매다 means to fasten, tie, or put on something by securing it around the body.

That is why Korean says:

• 넥타이를 매다 = tie a necktie
• 신발끈을 매다 = tie shoelaces
• 안전벨트를 매다 = fasten a seatbelt

So 안전벨트를 매요 is the standard expression for fasten/wear a seatbelt.

Yes, this is a very common confusion.

• 매다 = tie/fasten

  • 안전벨트를 매다
  • 넥타이를 매다

• 메다 = carry on the shoulder/back

  • 가방을 메다 = wear/carry a bag on your shoulder

So in this sentence, 매요 is correct because a seatbelt is something you fasten, not something you carry on your shoulder.

Here, 꼭 means something like:

• definitely
• without fail
• be sure to

So 안전벨트를 꼭 매요 means not just I fasten the seatbelt, but I make sure to fasten the seatbelt.

In many situations, 꼭 adds a feeling of strong emphasis or habit.

Korean present tense is often used for habits or general behavior, not just actions happening right now.

So this sentence means something like:

• Whenever I get in a taxi, I make sure to fasten my seatbelt right away.

It is describing a regular habit.
If you were talking about one specific past event, you would use past tense instead.

Korean often leaves out the subject when it is already understood from context.

So this sentence could mean:

• I fasten my seatbelt as soon as I get in a taxi.
• You should fasten your seatbelt as soon as you get in a taxi.
• or even a general one/people meaning, depending on context.

If you want to make the subject explicit, you could say:

• 저는 택시를 타자마자 안전벨트를 꼭 매요.

They are similar, but not the same.

• 타자마자 = as soon as I get in

  • very immediate
  • the second action happens right away

• 타고 나서 = after getting in

  • just shows sequence
  • not necessarily immediate

• 타면 = when/if I get in

  • more general
  • does not strongly emphasize immediacy

So 타자마자 is the best choice if you want to stress immediately after.

매요 is in the everyday polite -아요/어요 style, often called 해요-style.

It is natural in ordinary conversation and sounds polite but not overly formal.

Related styles:

• 매 / 매어 = casual
• 매요 = polite everyday speech
• 맵니다 = more formal

So this sentence is polite and natural for normal spoken Korean.