koteureul teoreun da-eume osgeorie georeo dumyeon bangi deol jeojeoyo.

Because 코트 ends in a vowel in Korean spelling: 트 has no final consonant 받침. Nouns ending in a vowel take -를, so:

• 코트 + 를 → 코트를

This is based on the Korean spelling, not the original English word coat.

Here 털다 means to shake off something attached to the coat, such as:

• rainwater
• snow
• dust
• dirt

So in this sentence, it is not about brushing stylishly or making the coat fluffy. It means removing moisture or debris by shaking it.

Here 다음에 means after in the pattern V + 다음에.

So 털은 다음에 means after shaking it off.

This is different from the very common standalone 다음에 meaning next time. In this sentence, it is part of a sequencing expression.

With 걸다 meaning to hang, -에 marks the place or target where something is hung.

So:

• 옷걸이에 걸다 = to hang it on a hanger

Here -에 works a bit like on / in / at, depending on the verb and context.

걸면 just means if/when you hang it.

걸어 두면 adds 두다, which gives the nuance of:

• doing something
• and leaving it in that state for a while

So 걸어 두면 means something like:

• if/when you hang it up and leave it there
• if/when you keep it hanging

In this sentence, that makes sense because the coat is being left there so water can drip or dry instead of spreading around the room.

두다 often means to put or to leave, but after another verb in the -아/어 두다 form, it means:

• do something in advance
• do something and leave it that way
• keep something in a certain state

So:

• 걸어 두다 = hang it up and leave it hanging

This is a very common grammar pattern in Korean.

It can be understood as either if or when, depending on context.

In this sentence, -면 introduces a general condition:

• If/When you shake off the coat and hang it on a hanger, the room gets less wet

English may choose if or when, but Korean -면 often covers both kinds of idea in practical statements like this.

Because the room is the thing that becomes wet.

The verb 젖다 means to get wet / become wet, so the thing before 이/가 is what experiences that change.

So:

• 방이 젖어요 = the room gets wet

This is why 방이 is natural here.

덜 means less.

So 덜 젖어요 means:

• gets less wet
• doesn’t get as wet

This is softer than saying 안 젖어요, which would mean doesn’t get wet. The sentence suggests the room may still get a little wet, but not as much.

Yes. The sentence strongly suggests that the coat is wet from something like:

• rain
• snow
• sleet
• outdoor moisture

The idea is practical: if you shake off the coat first and then hang it up, less water ends up in the room.

Yes, that would sound natural too.

A few options are:

• 코트를 털고 옷걸이에 걸어 두면...
• 코트를 털고 나서 옷걸이에 걸어 두면...
• 코트를 털은 다음에 옷걸이에 걸어 두면...

The differences are small:

• -고 simply connects actions
• -고 나서 emphasizes after doing
• 다음에 also clearly shows sequence

In everyday speech, many learners will hear -고 나서 and -고 very often.

Yes.

• 걸다 = to hang
• 옷걸이 = clothes hanger

So 옷걸이 is basically the thing used for hanging clothes. Seeing this connection can help you remember both words more easily.