jihacheol annaebangsongeul deutgo naseo chulgureul dasi hwaginhaesseoyo.

After listening to the subway announcement, I checked the exit again.

Breakdown of jihacheol annaebangsongeul deutgo naseo chulgureul dasi hwaginhaesseoyo.

• ~을: object particle
• ~를: object particle
• 듣다: to listen
• 고 나서: after

Questions & Answers about jihacheol annaebangsongeul deutgo naseo chulgureul dasi hwaginhaesseoyo.

Why is there no subject in this sentence?

In Korean, the subject is often omitted when it is obvious from context.

So 지하철 안내방송을 듣고 나서 출구를 다시 확인했어요 can naturally mean:

• I checked the exit again after listening to the subway announcement.
• He/She/They checked the exit again after listening to the subway announcement.

In real conversation, the listener usually already knows who the sentence is about.

What does 지하철 안내방송 mean as a unit?

지하철 안내방송 is a noun phrase made of:

• 지하철 = subway
• 안내방송 = announcement / guidance broadcast

Together, it means the subway announcement or the announcement on the subway.

This kind of compound noun is very common in Korean.

Why do both 안내방송을 and 출구를 use -을/-를?

Because both are direct objects of verbs.

• 안내방송을 듣고 = listen to the announcement
• 출구를 확인했어요 = checked the exit

The object marker -을/-를 shows what the action is directed toward.

• 안내방송 ends in a consonant, so it takes -을
• 출구 ends in a vowel, so it takes -를

What does -고 나서 mean here?