waipaiga an doenikka deiteoreul sseoyo.

Since the Wi‑Fi doesn’t work, I use mobile data.

Breakdown of waipaiga an doenikka deiteoreul sseoyo.

• ~를: object particle
• ~가: subject particle
• 쓰다: to use
• 안: not

Questions & Answers about waipaiga an doenikka deiteoreul sseoyo.

Why is 와이파이 followed by 가 instead of 를 or 은/는?

Here, 와이파이 is the thing that is or is not functioning, so it takes the subject marker 가.

• 와이파이가 안 돼요 = The Wi‑Fi doesn’t work
• It is not the object of an action, so 를 would not fit here.
• 은/는 could be used in some contexts for contrast, as in 와이파이는 안 되니까... if you want to emphasize as for the Wi‑Fi, it’s not working...

So 가 is the most neutral choice for stating that the Wi‑Fi is the thing in that condition.

What does 안 되다 mean here?

In this sentence, 안 되다 means to not work, to not function, or to be unavailable.

So:

• 와이파이가 안 돼요 = The Wi‑Fi isn’t working
• It does not mean to not become here, even though 되다 often means to become

Korean uses 되다 in many expressions, and one very common one is:

• 안 돼요 = It doesn’t work / It’s not allowed / It won’t do

The exact meaning depends on context. With 와이파이, it clearly means isn’t working.

Why is it 되니까 and not just 안 돼서 or 그래서?