biga waseo ppallaereul bang ane neoreoyo.

object particle

Breakdown of biga waseo ppallaereul bang ane neoreoyo.

• ~가: subject particle
• ~아서: because
• 방: room

Questions & Answers about biga waseo ppallaereul bang ane neoreoyo.

What does 와서 mean here?

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.

Why does 오다 become 와서 instead of 오아서?

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

Why is it 비가 and not 비를?