biga waseo ppallaereul bang ane neoreoyo.

Here 와서 is the connective form of 오다 (to come) used with -아서/어서.

In this sentence, it means because it rains / since it’s raining, not and then comes.

So:

• 비가 와서 = because it’s raining
• 빨래를 방 안에 널어요 = I hang the laundry inside the room

The -아서/어서 ending often connects two actions or clauses, and here it gives a reason.

This is a very common contraction in Korean.

• 오다
  • -아서 → 오아서 → 와서

So 와서 is just the natural contracted form.

You will see the same kind of thing in other forms too:

• 오다 → 와요
• 오다 → 왔어요

Because 비 (rain) is the subject of the verb 오다 (to come / to fall, for rain).

So:

• 비가 오다 = rain falls / it rains

Here, 가 marks 비 as the subject.

You would not use 비를 오다 in standard Korean.

A learner may also wonder about 비는:

• 비가 와서 = neutral statement, simply because it’s raining
• 비는 와서 would sound contrastive or topical, like as for the rain, it’s coming..., which is not natural here

Korean very often leaves out subjects like I, you, he, or she when they are understood from context.

So even though the sentence does not say 저는 or 제가, the meaning can still be:

• I hang the laundry inside the room because it’s raining

If you wanted to make I explicit, you could say:

• 저는 비가 와서 빨래를 방 안에 널어요.

But in everyday Korean, leaving it out is very normal.

빨래 usually means laundry or the clothes being washed / to be dried.

In this sentence, 빨래를 널다 means to hang the laundry out to dry.

So 빨래 is not just the act of washing. Depending on context, it can refer to:

• laundry as a chore
• washed clothes
• clothes that need drying

Here it clearly means the laundry / the washed clothes.

방 안에 literally means inside the room.

Breakdown:

• 방 = room
• 안 = inside
• 에 = in / at / to

So:

• 방에 = in the room
• 방 안에 = inside the room

In many situations, 방에 and 방 안에 are both possible, but 방 안에 is more explicit. It emphasizes that the laundry is being hung indoors, not outside.

That is a very common question.

Here, 에 marks the place where something is put, hung, or located.

With 널다 (to spread out / hang out to dry), Korean usually uses 에 for the place where the laundry is hung:

• 빨래를 방 안에 널다

Using 에서 would sound unnatural here.

A useful way to think about it:

• 에 often marks a destination or placement location
• 에서 often marks the place where an action is carried out in a more general sense

Since the laundry is being placed/hung in that location, 에 is the natural choice.

널어요 comes from 널다, which means to spread out or to hang something out to dry, especially laundry.

So in this sentence:

• 빨래를 널어요 = I hang the laundry out to dry

This verb is especially common with things like:

• clothes
• blankets
• laundry

It gives the idea of spreading or hanging something so it can dry.

They can both involve hanging something, but they are not the same.

• 널다 = to hang out / spread out something, especially laundry for drying
• 걸다 = to hang something up, like a coat, picture, bag, or phone call

Examples:

• 빨래를 널다 = hang laundry out to dry
• 옷을 걸다 = hang clothes on a hanger
• 그림을 걸다 = hang a picture

So for laundry drying, 널다 is the more natural verb.

Korean present tense can cover several ideas that English separates.

널어요 can mean, depending on context:

• I hang
• I’m hanging
• I hang it inside when it rains

In this sentence, it most naturally means something like:

• I hang the laundry inside because it’s raining
• or I’m hanging the laundry inside because it’s raining

Korean often relies on context rather than changing the verb form the way English does.

If you wanted to make it clearly past, you would say:

• 비가 와서 빨래를 방 안에 널었어요. = I hung the laundry inside because it was raining.

널어요 is in the standard polite -어요 style.

That makes it appropriate for:

• everyday conversation
• speaking politely to someone you do not know well
• neutral spoken Korean

Compare:

• 널어요 = polite
• 널어 = casual/informal
• 넙니다 = formal

So this sentence is polite, natural, and conversational.

The basic order here is very typical:

• 비가 와서 = reason clause
• 빨래를 = object
• 방 안에 = location
• 널어요 = verb

Korean verbs usually come at the end, so the final verb position is the most important thing to keep.

Because particles show each word’s role, Korean word order is somewhat flexible, but this version is very natural and standard:

• 비가 와서 빨래를 방 안에 널어요.

A different order may still be possible in some contexts, but this one is the safest and most natural for learners.