biga waseo chinguege usaneul billyeo jwosseoyo.

Because it was raining, I lent an umbrella to a friend.

Breakdown of biga waseo chinguege usaneul billyeo jwosseoyo.

• ~을: object particle
• 친구: friend
• ~가: subject particle
• ~에게: dative particle

Questions & Answers about biga waseo chinguege usaneul billyeo jwosseoyo.

What does -아서/어서 mean in 비가 와서?

Here, -아서/어서 means because.

So 비가 와서 means because it was raining or since it was raining.

A useful thing to know is that -아서/어서 can also connect two actions in a sequence, like and then. But in this sentence, the most natural reading is reason/cause:

• 비가 와서 → because it was raining
• 친구에게 우산을 빌려 줬어요 → I lent my friend an umbrella

So together, it means something like Because it was raining, I lent my friend an umbrella.

Why is it 와서 and not 오아서?

Because 오다 changes when you add -아서.

• dictionary form: 오다 = to come
• stem: 오-
• 오 + 아서 contracts to 와서

So:

• 오아서 → not used
• 와서 → correct

This is a very common contraction:

• 오다 → 와요
• 오다 → 와서
• 오다 → 왔어요

Why is it 비가 and not 비는?