sanchaekroneun kkaekkeushan banmyeon hacheoneun ajik oyeomdoeeo issseupnida.

The walking trail is clean, whereas the stream is still polluted.

Breakdown of sanchaekroneun kkaekkeushan banmyeon hacheoneun ajik oyeomdoeeo issseupnida.

• 있다: to be
• 아직: yet
• 깨끗하다: clean
• 반면: on the other hand

Questions & Answers about sanchaekroneun kkaekkeushan banmyeon hacheoneun ajik oyeomdoeeo issseupnida.

What does 반면 mean in this sentence?

반면 means on the other hand, whereas, or in contrast. It connects two clauses that are being compared or contrasted.

In this sentence:

• 산책로는 깨끗한 반면
• 하천은 아직 오염되어 있습니다

the speaker is contrasting the two places:

• the walking path is clean
• the stream is still polluted

So A-(으)ㄴ 반면 B is a very common pattern meaning while A is..., B is... or whereas A..., B....

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Why is it 깨끗한 반면 and not 깨끗하다 반면?

This is because 반면 commonly attaches to a modifier form before it.

For descriptive verbs/adjectives, you usually use:

• A-(으)ㄴ 반면

So:

• 깨끗하다 → dictionary form
• 깨끗한 → modifying form
• 깨끗한 반면 → while it is clean / whereas it is clean

This is just the normal grammar pattern.
Other examples:

• 조용한 반면 시끄러운 곳도 있다 = While some places are quiet, others are noisy.
• 빠른 반면 불안정하다 = It is fast, but on the other hand it is unstable.

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Why is 는 used in both 산책로는 and ?