damdang guyeogeul hwaginhago jeonghwa hwaldongeul kkeutnaessseupnida.

담당 구역 is a noun phrase meaning the area/zone one is responsible for.

• 담당 = being in charge of something, responsibility, assignment
• 구역 = area, zone, section

So 담당 구역 is not just any area; it is the assigned area or the area under one’s responsibility.

The 을 is the object marker.

In 담당 구역을 확인하고:

• 담당 구역 = assigned area
• 을 = marks it as the direct object
• 확인하다 = to check / confirm

So the sentence is saying that the speaker checked the assigned area.

확인하고 comes from 확인하다 (to check, confirm) plus -고, a connective ending.

Here, -고 links two actions:

• 담당 구역을 확인하고
• 정화 활동을 끝냈습니다

This usually means and or and then. So the flow is:

1. checked the assigned area
2. finished the cleanup activity

In this sentence, -고 mainly connects actions in sequence. It does not strongly suggest cause-and-effect by itself.

Usually, yes.

With action verbs, -고 often suggests that one action happened and then the next happened. So the natural reading is:

• first, the assigned area was checked
• then, the cleanup activity was completed

However, -고 is a fairly neutral connector, so its main job is just to join the two actions.

정화 활동 is a noun + noun combination.

• 정화 = purification, cleanup, sanitizing, environmental cleaning, etc.
• 활동 = activity

Together, 정화 활동 means something like:

• cleanup activity
• sanitation activity
• cleaning/purification work

The exact English wording depends on context, but grammatically it is simply a compound noun.

This is a very common question.

• 끝내다 = to finish something / to bring something to an end
  → transitive verb
• 끝나다 = to end / be finished
  → intransitive verb

Here the sentence has an object:

• 정화 활동을 끝냈습니다
• finished the cleanup activity

Because the speaker is finishing something, Korean uses 끝내다.

Compare:

• 정화 활동을 끝냈습니다 = We finished the cleanup activity.
• 정화 활동이 끝났습니다 = The cleanup activity ended / is over.

So the choice depends on whether you are focusing on someone completing it or it coming to an end.

The subject is omitted, which is very normal in Korean.

The sentence does not explicitly say I, we, they, or another subject. Korean often leaves out subjects when they are clear from context.

So depending on the situation, this could mean:

• I checked the assigned area and finished the cleanup activity.
• We checked the assigned area and finished the cleanup activity.
• They checked the assigned area and finished the cleanup activity.

You determine the subject from the surrounding context, not from this sentence alone.

끝냈습니다 is:

• past tense
• formal polite style (-습니다 style)

Breakdown:

• 끝내- = verb stem
• -었- / -았- = past tense marker
• -습니다 = formal polite ending

Because 끝내다 combines with the past marker, it becomes 끝냈습니다.

This style is commonly used in:

• reports
• announcements
• official writing
• formal spoken situations

Either can work, but check is often the most natural choice in this sentence.

확인하다 can mean:

• to check
• to confirm
• to verify

In 담당 구역을 확인하고, the nuance is probably check/inspect the assigned area. If the context is more administrative, confirm could also fit. Korean 확인하다 is broader than any one English word, so the best choice depends on context.

In Korean, it is very natural to use 끝내다 with a noun referring to a task, process, event, or activity.

So 정화 활동을 끝냈습니다 is grammatically normal and means that the speaker completed that activity.

Korean often uses noun + 하다 or noun + 끝내다 structures where English might prefer a more verb-like expression. So although English may sometimes sound more natural with finished cleaning, Korean comfortably says finished the cleanup activity.

Yes, and each version would have a slightly different feel.

• 확인하고 = checked it and then...
  • simple, neutral connection
• 확인한 후 = after checking...
  • more explicitly marks the first action as happening before the second
• 확인해서 = checked it, so / after checking...
  • can suggest a causal or procedural link

The original 확인하고 is very natural if the speaker just wants to list the actions in a straightforward way.