biga onikka usaneul sseoyo.

Because it’s raining, I use an umbrella.

Breakdown of biga onikka usaneul sseoyo.

• ~을: object particle
• ~가: subject particle
• 비: rain
• 오다: to rain

Questions & Answers about biga onikka usaneul sseoyo.

What does -니까 mean in 비가 오니까?

-니까 attaches to a verb/adjective stem and means because/since (giving a reason).
So 비가 오니까 … = Since it’s raining … / Because it’s raining ….
It often sets up the reason for what comes next (an action, suggestion, request, etc.).

What’s the difference between -니까 and -아서/어서 (e.g., 비가 와서)?

Both can mean because, but the feel can differ:

• -아서/어서 is a very common, neutral “because/so,” often used for natural cause → result.
  • 비가 와서 우산을 써요. (Because it’s raining, I use an umbrella.)
• -니까 can sound a bit more like the speaker is giving a reason, sometimes with a slightly stronger “given that…” tone, and it’s very common when following with a suggestion/request/command.
  • 비가 오니까 우산 쓰세요. (Since it’s raining, please use an umbrella.)

In many everyday cases, both are acceptable; -니까 is especially common when you’re telling someone what to do next.

Why is it 비가 and not 비는?

비가 uses the subject marker -가/-이, which is typical for describing what’s happening:

• 비가 오다 = rain comes/falls → “It’s raining.”

비는 (topic marker -는) is possible, but it shifts the nuance to “as for rain…” (contrast/topic):

• 비는 오지만 바람은 안 불어요. (As for rain, it’s raining, but there’s no wind.)

In a simple “It’s raining” reason clause, 비가 is the default.